taxonID	type	description	language	source
3F11B974FFCFFFF23CAA9F3FF42930A2.taxon	description	Figure 2 A	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFCFFFF23CAA9F3FF42930A2.taxon	materials_examined	Material examined. MALAYSIA • 1 ♂, 160 mm disc width (DW), tail missing; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (1) 00003. Identification. A small species of dasyatid (maximal disc width less than 180 mm); snout elongate, forming a projecting tip; anterior disc margins slightly concave; eye small; large band of compact denticles running along centre of the disc to the tail sting; dorsal surface of the disc light grey-brown, paler on margins, ventral side of the disc white (Carpenter and Niem 1999 a). Brevitrygon walga can be distinguished from all other stingrays occurring in this region by its large band of compact denticles running along centre of disc. A common coastal species in Southeast Asia regularly occurring in brackish environments. Generic classifica- tion follows Last et al. (2016); this species was previously classified in the genus Himantura (e. g., Weigmann 2011).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFCFFFF23F289F01F3BA3293.taxon	description	Figure 2 D	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFCFFFF23F289F01F3BA3293.taxon	materials_examined	Material examined. MALAYSIA • 1, 170 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.625 ° N, 100.394 ° E; 10 Oct. 2019; Sébastien Lavoué leg.; USMFC (114) 00001.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFCFFFF23F289954F22F33DE.taxon	description	Figure 2 C	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFCFFFF23F289954F22F33DE.taxon	materials_examined	Material examined. MALAYSIA • 1 ♂, 475 mm DW; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (104) 00001. • 1 ♂, 285 mm DW; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (104) 00002.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFCFFFF23F289C4BF2293029.taxon	description	Figure 2 E	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFCFFFF23F289C4BF2293029.taxon	materials_examined	Material examined. MALAYSIA • 1, 254 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (106) 00001.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFCFFFF23CAA9DC4F26E3590.taxon	description	Figure 2 B	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFCFFFF23CAA9DC4F26E3590.taxon	materials_examined	Material examined. MALAYSIA • 1 ♀, 148 mm DW, tail missing; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (1) 00002. Identification. A small species of dasyatid (maximal disc width less than 300 mm); elongated snout with largely concave disc anterior margins; eye small; no dark transverse band through the eyes; dorsal surface of the disc uniformly brown, ventral side of the disc uniformly pale greyish (Carpenter and Niem 1999 a). According to Weigmann (2011), T. zugei can be distinguished from all other stingrays occurring in this region by its very elongated snout with the broadly concave anterior margins of the disc. A common coastal species in Southeast Asia regularly occurring in brackish environments. Generic classification follows Last et al. (2016); previously classified in the genus Dasyatis.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFCFFFFC3F289DFCF65334F3.taxon	materials_examined	Material examined. MALAYSIA • 2, 339 – 340 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (72) 00001. Identification. A large species of herring-like fish (max- imum TL reported about 1000 mm); body very elongated and strongly compressed; no scutes along the belly; mouth large with two exposed fang-like canine teeth pointing forward in the upper jaw; large teeth in lower jaw; no lateral line; dorsal and anal fins beginning at about the same level, well behind midpoint of body; anal fin longer than dorsal fin, caudal fin forked; back dark blue, flanks and belly silver; fins mostly translucent (Whitehead 1985). Wolf herrings (genus Chirocentrus) are straightforwardly recognisable. Only two species are valid and occur in this region: C. nudus resembles Chirocentrus dorab (Forsskål, 1775) but can be distinguished by the absence of black marking on dorsal fin. Chirocentrus nudus is a predominantly coastal marine species; young individuals occasionally occur in brackish ecosystems. Widely distributed in the Indo-West Pacific region (Whitehead 1985).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC1FFFC3CAA99C9F37F37B5.taxon	description	Figure 3 B	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC1FFFC3CAA99C9F37F37B5.taxon	materials_examined	Material examined. MALAYSIA • 3, 121 – 125 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (5) 00005. • 1, 100 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (5) 00006. • 5, 61 – 111 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (5) 00008. Identification. A small species of Clupeidae (maximum TL about 100 mm); body deep, laterally compressed and strongly keeled from isthmus to anus; mouth small inferior; last dorsal fin ray not filamentous; lower gill rak- ers 54 – 96 (on first gill arch; data from Whitehead 1985); longest gill rakers on lower part of arch less than corresponding gill filaments; posterior edges of scales in- dented, the indentations smaller than gaps between them; body silver, back darker; a large, dark, ovoid mark behind upper part of gill opening, covering about four scales. Fins mostly translucent (Whitehead 1985). Anodontostoma chacunda can be distinguished from other clupeids collected by its deep body, high number of lower gill rakers and a conspicuous large dark ovoid mark behind upper part of gill opening. Anodontostoma chacunda is a predominantly coastal marine species and one of the most common species of Clupeidae occurring in brackish ecosystems of this region (e. g., Tongnunui et al. 2002; this study). Otherwise, distributed in the Indo-West Pacific region, from the Persian Gulf to Australia (Whitehead 1985).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC1FFFC3F289ACBF3D1331E.taxon	description	Figure 3 C	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC1FFFC3F289ACBF3D1331E.taxon	materials_examined	Material examined. MALAYSIA • 5, 91 – 101 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (5) 00003. Identification. A small species of Clupeidae (maximum TL about 100 mm); body relatively deep, strongly compressed and fully keeled from isthmus to anus (scutes 28 – 30); mouth small, upward; last dorsal fin ray not fila- mentous; lower gill rakers 16 – 25 (on first gill arch); body light greyish / greenish with a large (i. e., 1 ½ larger than eye diameter) silver lateral stripe on flanks, from the opercular margin to caudal fin base; paired lines of mela- nophores along back, from occiput to caudal fin base; fins mostly translucent; caudal fin with black margin (White- head 1985). Escualosa thoracata can be distinguished from other clupeids occurring in the Merbok river estuary by the presence of large silver lateral stripe on flanks. Escualosa thoracata is a predominantly coastal marine species and a common species of Clupeidae caught in brackish ecosystems of this region (e. g., Tongnunui et al. 2002). Otherwise, distributed in the Indo-West Pacific region, from India to Australia (Whitehead 1985).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC1FFFC3F289EA3F4D13F44.taxon	materials_examined	Material examined. MALAYSIA • 1, 57 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (5) 00007. • 1, 75 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.625 ° N, 100.394 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (5) 00009. Identification. Recently rediagnosed by Stern et al. (2016). A moderate-sized species of Clupeidae (maximum TL about 150 mm); body relatively deep, strongly compressed and fully keeled from isthmus to anus (scutes 30 or 31); mouth small, upward; no lateral line; last dorsal fin ray not filamentous; lower gill rakers 47 – 64 (on first gill arch); vertical striae on scales discontinuous, not meeting at centre; flanks and belly silver, dorsum dark grey-blue; a black mark at the dorsal fin base, a diffuse ovoid black mark behind upper part of gill opening. Sardinella albella is similar to Sardinella gibbosa (Bleeker, 1849) occurring in the Merbok river estuary but it can be distinguished by its deeper body and lower number of scutes (31 or less vs. 32 in S. gibbosa). Sardinella albella is a predominantly coastal marine species and a common species of Clupeidae caught in brackish ecosystems of this region (Tongnunui et al. 2002). Otherwise, widely distributed in the Indo-West Pacific region (Whitehead 1985).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC3FFFE3CAA9E05F3B037B5.taxon	description	Figure 3 D	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC3FFFE3CAA9E05F3B037B5.taxon	materials_examined	Material examined. MALAYSIA • 3, 62 – 65 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.625 ° N, 100.394 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (103) 00001. Identification. Species recently rediagnosed and revalidated in Hata et al. (2021); maximum TL about 150 mm; body elongated and rounded; belly not keeled without pre- and post-pelvic scutes; W-shaped pelvic scute; no predorsal scute; branchiostegal rays 12 – 17; rectangular premaxillae; mouth terminal; anal fin short with three unbranched and 11 – 14 branched fin rays; gill rakers on first gill arch 33 – 41; no teeth on parasphenoid; dor- sal part of the body deep blue, lateral and ventral parts uniformly silver; deep blue and silver parts separated by yellow-greenish longitudinal stripes on each side (Hata et al. 2021); fins mostly translucent with melanophores scattered on 3 rd to 9 th pectoral-fin rays (numerated from the uppermost ray). Dussumieria albulina closely resembles Dussumieria acuta Valenciennes, 1847, but it can be distinguished by the absence of teeth on parasphenoid and the presence of black marking on 3 rd to 9 th pectoral-fin rays (Hata et al. 2021). Previous records of D. acuta in this region may refer to D. albulina (although the two species may also occur sympatrically). Dussumieria albulina is a predominantly coastal marine species commonly recorded in brackish ecosystems of this region; we collected three juveniles from the Merbok river estuary. Otherwise, distributed in the Indo-West Pacific region, from India to the Philippines (Hata et al. 2021).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC3FFFE3CAA9AAAF55334A0.taxon	materials_examined	Material examined. MALAYSIA • 2, 121 – 131 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (5) 00004. Identification. Recently rediagnosed in Stern et al. (2016). A moderate-sized species of Clupeidae (maximum TL about 170 mm); body relatively slender, strongly compressed and fully keeled from isthmus to anus (scutes 32); mouth small, upward; no lateral line; last dorsal fin ray not filamentous; lower gill rakers on first gill arch 48 – 69; vertical striae on scales discontinuous, not meeting at centre; flanks and belly silver, dorsum dark greyblue; a black mark at the dorsal fin base, a diffuse ovoid black mark behind upper part of gill opening. Sardinella gibbosa can be separated from S. albella occurring in the Merbok river estuary by a relatively slender body and more scutes. Sardinella gibbosa is a predominantly coastal marine species and one of the most common species of Clupeidae caught in brackish ecosystems of this region (Tongnunui et al. 2002). Otherwise, widely distributed in the Indo-West Pacific region, from India to Australia (Whitehead 1985).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC3FFFE3F289B0FF4853310.taxon	description	Figure 3 E	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC3FFFE3F289B0FF4853310.taxon	materials_examined	Material examined. MALAYSIA • 1, 141 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (82) 00047. Identification. A moderate sized species of anchovy (maximum SL <200 mm); body strongly laterally compressed; longer than deeper; very large mouth, its corner well behind the eye; anal fin rays 18 or 19; belly strongly keeled with 22 – 27 prepelvic scutes and 11 or 12 postpelvic scutes; gill rakers 18 – 20 only (on first gill arch); scales present on dorsal and anal fins; pectoral fin with a long filament reaching the posterior half of the anal fin; body uniformly silver sometimes orangish; no silver longitudinal stripe; no dark pigment line on back (Whitehead et al. 1988). The presence of a long pectoral filament makes it easy to separate S. taty from other species of anchovy recorded from the Merbok estuary. Setipinna taty is a predominantly coastal marine species although commonly frequenting brackish ecosystems of this region; it does not seem to form large school. Otherwise, widely distributed in the Indo-West Pacific region (Whitehead et al. 1988).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC3FFF83F289E96F5273793.taxon	materials_examined	Material examined. MALAYSIA • 1, 76 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (82) 00045. Identification. Species recently rediagnosed by Hata et al. (2020); a small species of anchovy (maximum TL about 100 mm); body elongated and compressed; large mouth, its corner behind the eye; anal fin short with three unbranched and 17 – 20 branched fin rays, its origin be- low about middle of dorsal fin base; gill rakers 33 – 38 (on first gill arch); posterior tip of the maxilla just reaching posterior margin of opercle; no predorsal scute; belly not keeled; pelvic scute without spine, small needle-like prepelvic scutes 5 – 7; no post-pelvic scutes; body light greyish / brownish with a silver longitudinal stripe from the opercular margin to caudal-fin base; no dark pigment line on back. Stolephorus baweanensis can be easily distinguished from other species of Stolephorus occurring in this region by “ numerous black spots on suborbital area (in adults), snout and tip of lower jaw ” (Hata et al. 2020: 21). Previously identified as Stolephorus waitei Jordan & Seale, 1926 (e. g., Tongnunui et al. 2002) but S. waitei is endemic to the Australian region (Hata et al. 2020). Stolephorus baweanensis is a predominantly coastal marine species. Although commonly caught in brackish ecosystems of this region, they do not seem to form large schools. Widely distributed in the northern Indo-West Pacific region (Hata et al. 2020).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC5FFF83CAA9F28F30F360A.taxon	materials_examined	Material examined. MALAYSIA • 4, 62 – 94 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (82) 00038. • 3, 65 – 69 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.625 ° N, 100.394 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (82) 00049. Identification. Small species of anchovy (maximum TL about 100 mm); body elongated and compressed; large mouth, its corner behind the eye; anal fin short with three unbranched and 15 – 19 branched fin rays, its origin be- low about middle of dorsal fin base; gill rakers 26 – 28 (on first gill arch); posterior tip of the maxilla pointed reach- ing or beyond posterior margin of opercle; small predorsal scute and pelvic scute with spine, belly not keeled; small needle-like prepelvic scutes 6 or 7, no post-pelvic scutes; body light greyish / brownish with a silver longitudinal stripe from the opercular margin to caudal-fin base; a pair of blackish patches behind occiput; a pair of double, black lines on back behind dorsal fin; caudal fin whitish-yellow with black margins; no black spots on suborbital area or lower-jaw tip (Whitehead et al. 1988). Stolephorus dubiosus is very similar to Stolephorus tri (Bleeker, 1852); it can be separated only by the number of lower gill rakers (more than 24 in S. dubiosus vs. less than 24 in S. tri). Often syntopic with Stolephorus tri (personal observation). Distributed in Southeast Asia (Whitehead et al. 1988).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC5FFF83F289BBFF3C6321A.taxon	materials_examined	Material examined. MALAYSIA • 1, 115 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (82) 00044. Identification. Species rediagnosed by Hata et al. (2021). The largest species of the genus Stolephorus (TL up about 150 mm); body rounded and slender; large mouth, its lateral articulation behind the eye; anal fin short with three unbranched and 15 – 18 branched fin rays, its ori- gin below about middle of dorsal fin base; gill rakers 36 – 43 (on first gill arch); posterior tip of the maxilla pointed reaching posterior margin of opercle; no predorsal scute; belly not keeled; pelvic scute without spine, small needle-like prepelvic scutes 3 – 5, no post-pelvic scutes; body light greyish / brownish with silvery head; a silver, longitudinal stripe from the opercular margin to caudal-fin base; a pair of black patches behind occiput; no pigment line on back; fins mostly translucent; no black spots on suborbital area or lower-jaw tip. Stolephorus indicus can be easily distinguished from other species of Stolephorus occurring in the Merbok river estuary by its rounded body, no predorsal scute, no pigment line on back, and no black spots on suborbital area or lower-jaw tip. Stolephorus indicus is a predominantly coastal marine species occasionally caught in brackish ecosystems of this region; it is an economically important species. Otherwise, distributed in the coastal zones of Indian Ocean (Hata et al. 2021).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC5FFF83CAA9B15F5443396.taxon	materials_examined	Material examined. MALAYSIA • 1, 62 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (82) 00050. Identification. Species described by Hata et al. (2021). A moderate-sized species of anchovy (maximum TL about 130 mm); body elongated and compressed; large mouth, its corner behind the eye; anal fin short with three unbranched and 16 – 19 branched fin rays, its origin be- low about middle of dorsal fin base; gill rakers 44 – 47 (on first gill arch); posterior tip of the maxilla just reach- ing posterior margin of opercle; no predorsal scute; belly not keeled; pelvic scute without spine; small, needle-like prepelvic scutes 2 – 5; no post-pelvic scutes; body light greyish / brownish with a silver longitudinal stripe from the opercular margin to caudal-fin base; pairs of occipi- tal darkish patches without a following pair of dark, thin stripes (Hata et al. 2021). Stolephorus mercurius can be easily distinguished from other species of Stolephorus occurring in the Merbok river estuary by its rounded body, no predorsal scute, no dark line on back, and no black spots on suborbital area or lower-jaw tip. Stolephorus mercurius is a predominantly coastal marine species occasionally caught in brackish ecosystems of this region; it is an economically important species. Otherwise, widely distributed in the West Pacific region (Hata et al. 2021).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC5FFFA3F289FAFF55B3685.taxon	description	Figure 3 F	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC5FFFA3F289FAFF55B3685.taxon	materials_examined	Material examined. MALAYSIA • 1, 94 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (82) 00039. Identification. Species recently rediagnosed by Hata et al. (2020); a small species of anchovy (maximum TL about 100 mm); body elongated and compressed; large mouth, its corner behind the eye; anal fin short with three unbranched and 15 – 19 branched fin rays, its origin below about middle of dorsal fin base; gill rakers 32 – 39 (on first gill arch); posterior tip of the maxilla pointed reaching or beyond posterior margin of opercle; small predorsal scute and pelvic scute with spine, belly not keeled; small needle-like prepelvic scutes 4 – 6, no post-pelvic scutes; body light greyish / brownish with a silver stripe from the opercular margin to caudal-fin base; a pair of blackish patches behind occiput followed by a pair of black pigment lines on back; caudal fin whitish-yellow with black margins; no black spots on suborbital area or lower-jaw tip. Stolephorus tri is identifiable from all other species of Stolephorus (except S. dubiosus) occurring in the Merbok estuary by the spine-like predorsal and pelvic scutes. Stolephorus tri can be distinguished from S. dubiosus by its lower number of gill rakers. A common coastal species which frequently occurs in brackish environments. Stolephorus tri is distributed in the central part of the Indo West Pacific region (Hata et al. 2020).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC7FFFA3CAA983BF56432CC.taxon	materials_examined	Material examined. MALAYSIA • 2, 145 – 166 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (82) 00041. • 2, 97 – 168 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (82) 00043. Identification. A relatively large species of anchovy (maximum TL about 250 mm); body elongated, compressed and keeled from isthmus to anus; large mouth, its corner behind the eye; anal fin long with 3 unbranched and 35 – 37 branched fin rays; less gill rakers 12 – 14 (on first gill arch); maxilla moderately long, reaching to edge of gill cover; prepelvic scutes 16 – 19; post-pelvic scutes 8 – 9; body silvery with a conspicuous black blotch behind upper part of gill opening; no silver longitudinal stripe; pigment lines along dorsum (Whitehead et al. 1988). Thryssa hamiltonii can be easily distinguished from other species of Thryssa occurring in Merbok river estuary by its moderately long maxilla reaching to edge of gill cover. Thryssa hamiltonii is a predominantly coastal marine species occasionally caught in brackish ecosystems of this region; it is an economically important species. Otherwise, widely distributed in the Indo-West Pacific region (Whitehead et al. 1988).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC7FFFA3CAA9FF2F21F35D6.taxon	materials_examined	Material examined. MALAYSIA • 5, 79 – 96 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (82) 00040. • 5, 87 – 102 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (82) 00042. • 1, 85 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (82) 00046. • 5, 86 – 103 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 5 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (82) 00048. Identification. A small species of Thryssa (maximum TL about 100 mm); body elongated, compressed and keeled from isthmus to anus; large mouth, its corner behind the eye; anal fin long with three unbranched and 30 – 33 branched fin rays; only 26 – 32 gill rakers on first gill arch; maxilla short, its posterior tip reaching just to gill opening; prepelvic scutes 15 or 16; post-pelvic scutes 8 or 9; body mostly silvery with a diagnostic blackish “ saddle ” on nape (Whitehead et al. 1988); no silver longitudinal stripe; no pigment line on dorsum (Whitehead et al. 1988). Thryssa kammalensis can be easily distinguished from other species of Thryssa occurring in the Merbok river estuary by its very short maxilla reaching only to gill opening. Thryssa kammalensis is a coastal marine species commonly caught in brackish ecosystems of this region. Otherwise, distributed in the central part of the Indo-West Pacific region (Whitehead et al. 1988).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC7FFFA3F2898E8F22631D2.taxon	materials_examined	Material examined. MALAYSIA • 1, 120 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (82) 00051. • 1, 141 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (82) 00052. Identification. A moderate-sized species of anchovy (maximum TL about 150 mm); body elongated, compressed and keeled from isthmus to anus; large mouth, its corner behind the eye; anal fin long with three un- branched and 29 – 37 branched fin rays; lower gill rak- ers 14 – 16 (on first gill arch); maxilla long, its posterior tip of the maxilla almost reaching to base of first pec- toral fin ray; prepelvic scutes 17 – 19; post-pelvic scutes 8 – 13; body uniformly silvery with a conspicuous blackish blotch behind upper part of gill opening; no silver longitudinal stripe; no pigment line on dorsum (Whitehead et al. 1988). Thryssa mystax can be easily distinguished from other species of the genus Thryssa occurring in the Merbok river estuary by its long maxilla reaching to base of first pectoral fin ray. Thryssa mystax is a predominantly coastal marine species occasionally caught in brackish ecosystems of this region; it is an economically important species. Otherwise, widely distributed in the Indo- West Pacific region (Whitehead et al. 1988).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC7FFFB3F289D2BF428366C.taxon	description	Figure 3 G	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC7FFFB3F289D2BF428366C.taxon	materials_examined	Material examined. MALAYSIA • 5, 123 – 136 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (92) 00004. • 1, 87 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (92) 00006. Identification. A moderate-sized species of the family	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC6FFFB3CAA9D55F7D03F44.taxon	materials_examined	Material examined. MALAYSIA • 3, 75 – 95 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (66) 00005.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC6FFFB3F289A95F48B36E7.taxon	description	Figure 5 J Material examined. MALAYSIA • 5, 235 – 260 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (66) 00008.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC6FFFB3F289B9EF48B351D.taxon	materials_examined	Material examined. MALAYSIA • 3, 275 – 320 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (66) 00002.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC6FFFB3F2898A3F2AF3455.taxon	materials_examined	Material examined. MALAYSIA • 1, 128 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (66) 00006.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC6FFFB3CAA9966F42B33C0.taxon	materials_examined	Material examined. MALAYSIA • 5, 120 – 139 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (92) 00005. • 5, 70 – 83 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 5 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (92) 00007. Identification. A moderate-sized species of Pristigas-	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC6FFFB3F28996BF48A334B.taxon	materials_examined	Material examined. MALAYSIA • 5, 189 – 250 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (66) 00009.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC6FFFB3F289E7DF31E321B.taxon	materials_examined	Material examined. MALAYSIA • 1, 225 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (66) 00003. • 2, 285 – 290 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (66) 00004.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC6FFFB3F289FA2F2AF3153.taxon	materials_examined	Material examined. MALAYSIA • 1, 280 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (66) 00007.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC6FFFB3F289C55F2A9306B.taxon	materials_examined	Material examined. MALAYSIA • 1, 400 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (66) 00010.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC6FFFB3F289D50F2AF3F44.taxon	description	Figure 5 K	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC6FFFB3F289D50F2AF3F44.taxon	materials_examined	Material examined. MALAYSIA • 1, 248 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (93) 00002.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFC6FFFB3CAA9B3BF52E3441.taxon	description	Ilisha melastoma can easily be distinguished from Opisthopterus tardoore (Cuvier, 1829) by the presence of pelvic fins, a longer dorsal fin, and a relatively deeper body. Ilisha melastoma is a predominantly coastal marine species tolerating salinity variation and commonly entering brackish ecosystems of this region (Tongnuinui et al. 2002). Otherwise, widely distributed in the Indo-West Pacific region (Whitehead 1985).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD9FFE43F289C03F2AE31B4.taxon	materials_examined	Material examined. MALAYSIA • 1, 73 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (34) 00015.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD9FFE43CAA9850F5B63228.taxon	materials_examined	Material examined. MALAYSIA • 1, 76 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 10 Oct. 2019; Sébastien Lavoué leg.; USMFC (102) 00002. Identification. Maximum TL about 150 mm; body robust, slightly dorso-ventrally compressed; head broad and flattened, many short fleshy appendages around jaws; two subopercular spines; mouth large, terminal; gill openings small, restricted to sides of body; pectoral fins broad, no pore at top of pectoral-fin axil, pelvic fins anterior to pectoral fins; dorsal fin notched, first part spi- nous and short; second part soft and long. Body and fins brown with the presence of irregular marks consisting of few large and many small darker brown blotches. In the Merbok region, A. grunniens can be distinguished from Batrachomoeus trispinosus (Günther, 1861) by the absence of a foramen behind the upper part of the pectoral fin insertion (Greenfield et al. 2008). Allenbatrachus grunniens is not often recorded in this region. A marine species widely distributed in the Indo- West Pacific region supporting lower salinity.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD9FFE43CAA9F5EF3FB3671.taxon	description	Figure 2 G	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD9FFE43CAA9F5EF3FB3671.taxon	materials_examined	Material examined. MALAYSIA • 1, 102 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (102) 00001. Identification. Maximum TL about 200 mm; body robust, slightly dorso-ventrally compressed; head broad and flattened, many short fleshy appendages around jaws; one strong subopercular spine; mouth large, terminal; gill openings smaller than pectoral fin base, re- stricted to sides of body; pectoral fins broad, distinct pore at top of pectoral fin axil, pelvic fins anterior to pec- toral fins; dorsal fin notched, first part spinous and short; second part soft and long. Body brown with two or three large and irregularly shaped, dark-brown, vertical bars on each side, that do not extend on dorsal and anal fins. Fins opaque, uneven brown. The genus Batrachomoeus can be distinguished from the genus Allenbatrachus by the presence of a foramen behind the upper part of the pectoral fin insertion (Greenfield et al. 2008). Batrachomoeus trispinosus seems more common than A. grunniens in Merbok. A marine species widely distributed in the Indo-West Pacific region supporting lower salinity.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD9FFE43F289D35F2A930A8.taxon	description	Figure 3 L	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD9FFE43F289D35F2A930A8.taxon	materials_examined	Material examined. MALAYSIA • 1, 127 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (34) 00016.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD9FFE43F289B94F2A5345C.taxon	description	Figure 3 J	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD9FFE43F289B94F2A5345C.taxon	materials_examined	Material examined. MALAYSIA • 2, 21 – 25 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.625 ° N, 100.394 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (33) 00012. • 3, 113 – 125 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (33) 00003. • 2, 95 – 106 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.625 ° N, 100.394 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (33) 00014.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD9FFE43F28996DF3DC3263.taxon	description	Figure 3 K	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD9FFE43F28996DF3DC3263.taxon	materials_examined	Material examined. MALAYSIA • 1, 125 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.625 ° N, 100.394 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (33) 00001. • 5, 87 – 117 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (33) 00002. • 2, 109 – 112 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (33) 00004.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD9FFE43F289F04F31432B9.taxon	materials_examined	Material examined. MALAYSIA • 1, 25 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.625 ° N, 100.394 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (33) 00013.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD9FFE43CAA9AC8F600368B.taxon	materials_examined	Material examined. MALAYSIA • 3, 205 – 254 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (51) 00003.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD9FFE53F289DDEF5E933F6.taxon	materials_examined	Material examined. MALAYSIA • 3, 14 – 16 mm TL; Kedah State, Semeling, Semeling Bridge; 5.680 ° N, 100.470 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (34) 00020. Identification. A very small fish (TL ≤ 16 mm). Body relatively short; head large dorso-ventrally compressed; trunk and tail laterally compressed; only few large predorsal scales present; opercular scales present; anal fin rays 7; second dorsal fin rays 7 or 8; body color cream with four black bars all extending from mid-dorsal line to mid-ventral line; first bar extending to anterior part of first dorsal fin; second bar extending to anterior part of the second dorsal fin and extending to anterior part of anal fin; front head and snout black; first and second dor- sal fins, anal fin and pectoral fins with black marks. The taxonomy of the genus Brachygobius needs revision (Larson 2001). The combination of morphological characteristics of our specimens seems distinctive, making their identification difficult. Based on the identifi- cation key of Inger (1958), our species resembles to B. kabiliensis in having opercular scales, four black bars, and 7 rays at second dorsal and anal fins. However, the predorsal scale pattern and the shape of the first and sec- ond bars clearly distinguish our specimens from typical specimens of B. kabiliensis (as illustrated by Inger 1958: fig. 19; Huang et al 2013: fig. 1 g). In B. kabiliensis, the first bar does not extend to the mid-ventral line, the second bar does not reach the anal fin and the predorsal region seems fully scaled (Inger 1958). We preliminary identified our specimen as B. cf. kabiliensis. Further taxonomic work may show that it is a distinct species.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD8FFE53CAA9E8BF59F32A5.taxon	materials_examined	Material examined. MALAYSIA • 1, 152 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (34) 00018. • 1, 135 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.625 ° N, 100.394 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (34) 00025.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD8FFE53CAA9FDBF6A03072.taxon	materials_examined	Material examined. MALAYSIA • 2, 100 – 102 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (34) 00011. • 1, 98 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (34) 00014.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD8FFE53CAA9D74F31B37B5.taxon	materials_examined	Material examined. MALAYSIA • 2, 114 – 191 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (34) 00010. • 5, 164 – 239 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (34) 00012.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD8FFE53F289ACBF2A936EF.taxon	materials_examined	Material examined. MALAYSIA • 1, 25 mm TL; Kedah State, Semeling, Semeling Bridge; 05.680 ° N, 100.470 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (34) 00023.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD8FFE53F289B91F3193527.taxon	materials_examined	Material examined. MALAYSIA • 1, 85 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.625 ° N, 100.394 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (34) 00026.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD8FFE53F289859F44D345E.taxon	materials_examined	Material examined. MALAYSIA • 2, 149 – 151 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (34) 00017.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD8FFE53F289960F4853496.taxon	materials_examined	Material examined. MALAYSIA • 3, 18 – 23 mm TL; Kedah State, Semeling, Semeling Bridge; 05.680 ° N, 100.470 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (34) 00024.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD8FFE53F289E28F48533AE.taxon	materials_examined	Material examined. MALAYSIA • 2, 27 - 37 mm TL; Kedah State, Semeling, Semeling Bridge; 05.680 ° N, 100.470 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (34) 00022.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD8FFE53F289ED1F3AC3282.taxon	materials_examined	Material examined. MALAYSIA • 3, 50 – 54 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (34) 00019. • 3, 22 – 30 mm TL; Kedah State, Semeling, Semeling Bridge; 05.680 ° N, 100.470 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (34) 00021.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD8FFE63F289C24F66536ED.taxon	materials_examined	Material examined. MALAYSIA • 1, TL 160 mm; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.625 ° N, 100.394 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (34) 00027. Identification. Maximum TL less than 200 mm; body very elongated, moderately compressed laterally; standard length (SL)> 80 % of total length; head length> 20 % of SL; eye rudimentary; cephalic sensory canals and pores absent; pelvic fins forming a cup; body uniformly light pink. Trypauchen pelaeos is very similar to Trypauchen vagina (Bloch & Schneider, 1801), but it can be distinguished by its less elongated body (head length> 20 % of SL). The type locality of this recently described species is only 40 km south of the Merbok river estuary (Murdy 2006). It is a mud-dwelling species, but more information is needed on its ecology (Murdy 2006). Trypauchen pelaeos may be common in estuarine environments in Southeast Asia although rarely collected because of its burrowing behaviour. Trypauchen pelaeos occurs in brackish and coastal muddy habitats in Southeast Asia (Murdy 2006).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDBFFE73F289F3EF50D3630.taxon	materials_examined	Hyporhamphus dussumieri (Valenciennes, 1847) Material examined. MALAYSIA • 1, 235 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (105) 00002. Identification. Maximum TL (from the upper jaw tip) reported about 30 cm. Body elongate and rounded in cross section, with elongated lower jaw less than 1.5 times in head length; short triangular upper jaw with pointed tip; caudal fin unevenly forked (lower lobe about 25 % lon- ger than upper lobe); gill rakers on first gill arch 36 to 47; body flanks and belly silver, back greenish / greyish; yel- lowish silver stripe on mid-lateral body. Within the Merbok River estuary, the halfbeak genus, Hyporamphus, is distinguishable from the viviparous halfbeak genera Dermogenys and Zenarchopterus (family Zenarchopteridae) by having the caudal fin unevenly forked (vs. rounded). Hyporhamphus dussumieri can be separated from Hyporhamphus quoyi (Valenciennes, 1847) by its proportionally longer lower jaw (contained <5 times in SL) and the pointed tip of its upper jaw, among other characteristics. Hyporhamphus dussumieri is a coastal species, sporadically frequenting estuaries. Tongnunui et al. (2002) reported two different species of Hyporhamphus, Hyporhamphus affinis (Günther, 1866) and Hyporhamphus limbatus (Valenciennes, 1847).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDBFFE63CAA9EF9F60D321F.taxon	materials_examined	Material examined. MALAYSIA • 3, 27 – 35 mm TL; Kedah State, Semeling, Semeling Bridge; 5.680 ° N, 100.470 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (108) 00001.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDBFFE63CAA9FC7F4C036CC.taxon	materials_examined	Material examined. MALAYSIA • 3, 28 – 35 mm TL; Kedah State, Semeling, Semeling Bridge; 05.680 ° N, 100.470 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (101) 00002. Identification. A small species of Adrianichthyidae (maximum TL <40 mm). Body deep, laterally compressed; eyes large; small mouth terminal; pectoral fins set relatively high on side of body; single dorsal fin set posteriorly; caudal fin truncate; no lateral line. Dorsal and anal fin rays of male longer and thicker than those of female. Yusof et al. (2012) reported the presence of two species of Oryzias along the west coast of Peninsular Malaysia, O. javanicus and Oryzias dancena (Hamilton, 1822). According to Yusof et al. (2012), O. javanicus is separated by its silvery eyes and dorsal black lines whereas O. dancena exhibits shiny blue eyes and no black line on body. Furthermore, O. javanicus is a typical brackish species, living in higher salinity habitats than O. dancena which is more freshwater tolerant which may explain why we did not collect it (Yusof et al. 2012). Oryzias javanicus is the first species (and so far, the only one) for which its whole genome has been sequenced from specimens originating from this region (i. e., Penang region) (Takehana et al. 2020).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDBFFE63F289836F4543388.taxon	description	Figure 2 H	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDBFFE63F289836F4543388.taxon	materials_examined	Material examined. MALAYSIA • 3, 245 – 255 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 7.12.2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (89) 00002. Identification. Maximum TL about 400 mm. Body very elongate (not eel-like) and cylindrical; elongated upper and lower jaws forming pointed snout; sharp teeth in both jaws; caudal fin rounded; dorsal-fin rays 12 – 15; anal-fin rays 15 – 18; body flanks and belly silver whitish, dorsally greenish; a distinct large (its diameter roughly equal to eye diameter) black spot on caudal fin, distal part of caudal fin yellowish. Strongylura strongylura is easily recognizable in the Merbok river estuary by its elongated upper and lower jaws and the presence of a distinct large black spot on caudal fin. Strongylura strongylura is a common coastal species which is often encountered in brackish mangrove ecosystems. Widely distributed in the Indo-West Pacific region.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDBFFE63CAA9B93F5413325.taxon	description	Figure 3 M	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDBFFE63CAA9B93F5413325.taxon	materials_examined	Material examined. MALAYSIA • 1, 129 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (34) 00013. Identification. Maximum TL less than 200 mm; body very elongated, moderately compressed laterally; standard length (SL) <80 % of total length; head length <20 % of SL; eye rudimentary; cephalic sensory canals and pores absent; pelvic fins forming a cup; body uniformly light pink. Trypauchen vagina can be distinguished from T. pelaeos, also occurring in the Merbok river estuary, by its more elongated body (head <20 % of SL). A mud-dweller species but more information is needed on the ecology of T. vagina. It seems to be common in muddy estuarine environments in Southeast Asia but not often collected. Trypauchen vagina occurs in brackish and coastal muddy habitats in Southeast Asia (Murdy 2006).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDAFFE73F28996CF48633C9.taxon	description	Figure 2 L	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDAFFE73F28996CF48633C9.taxon	materials_examined	Material examined. MALAYSIA • 1, 115 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (69) 00013. • 1, 188 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 4 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (69) 00014.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDAFFE73F289EFCF3DE3201.taxon	materials_examined	Material examined. MALAYSIA • 1, 130 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (69) 00015.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDAFFE73F289FA7F4873137.taxon	materials_examined	Material examined. MALAYSIA • 3, 123 – 136 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 4 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (69) 00012.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDAFFE73F289C49F3B330C9.taxon	materials_examined	Material examined. MALAYSIA • 2, 307 – 319 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 4 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (69) 00019. • 2, 236 – 251 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 4 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (69) 00020.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDAFFE73CAA9F12F6B130A6.taxon	materials_examined	Material examined. MALAYSIA • 3, 39 – 56 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.625 ° N, 100.394 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (105) 00004. Identification. A small species of the family Zenarchopteridae. Maximum TL (from the upper jaw tip) about 60 mm (Meisner 2001). Body slender and cylindrical, with elongated lower jaw and short triangular upper jaw; upper jaw longer than wide; male with upside-down triangular spiculus of male modified anal fin (i. e., andropodium; Meisner 2001) with distal tip oriented posteriorly; body light brown with translucent fins; thick black line along dorsum from occiput to caudal fin base. Dermogenys sumatrana is known from Lake Maninjau, West Sumatra (type locality), Borneo and south of Thailand (Meisner 2001; Lheknim 2004), and in the mangrove estuary of Sikao Creek (Tongnunui et al. 2002). This species is collected in the less saline part of the Merbok river estuary.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDAFFE73CAA9BB6F68933A9.taxon	description	Figure 2 I	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDAFFE73CAA9BB6F68933A9.taxon	materials_examined	Material examined. MALAYSIA • 3, 125 – 136 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (105) 00001. • 1, 151 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.625 ° N, 100.394 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (105) 00005. Identification. Maximum TL (from the upper jaw tip) reported about 300 mm. Body elongate and rounded in cross section, with elongated lower jaw, about twice longer than head length; short round upper jaw with rounded tip; caudal fin unevenly forked (lower lobe about 25 % longer than upper lobe); gill rakers on first gill arch 26 – 34; body flanks and ventral part silver, dorsum greenish / greyish; yellowish silver stripe on mid-lateral body. Hyporhamphus quoyi is distinguished from H. dussumieri by its proportionally shorter lower jaw (contained> 6 times in SL) and the rounded tip of its upper jaw. Hyporhamphus quoyi is a common coastal species in this region regularly frequenting estuary. This species was not reported in the mangrove estuary of Sikao Creek (Tongnunui et al. 2002).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDAFFE73CAA9DD9F45535B7.taxon	materials_examined	Material examined. MALAYSIA • 1, 143 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (105) 00003. Identification. Maximum TL (from the upper jaw tip) about 140 mm. Body elongated-cylindrical, with elongated lower jaw and short triangular upper jaw, wider than long; black line along the midline of the snout; black line along dorsum from occipital region to caudal fin base; 6 th anal ray in adult males slightly elongate and expanded to form an andropodium (Grier and Collette 1987); caudal fin rounded; body sides and belly sil- ver separated by a silver stripe running from gill opening to caudal fin base; caudal fin base dark greyish. Zenarchopterus buffonis is a common species in this region and it had been reported by Tongnunui et al. (2002).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDAFFE03F289DFFF7D1366D.taxon	materials_examined	Material examined. MALAYSIA • 1, 200 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 4 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (69) 00022.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDDFFE03F289AE9F48536A9.taxon	description	Figure 5 F	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDDFFE03F289AE9F48536A9.taxon	materials_examined	Material examined. MALAYSIA • 3, 264 – 312 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 4 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (84) 00007.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDDFFE03F28992FF24C3328.taxon	description	Figure 5 E	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDDFFE03F28992FF24C3328.taxon	materials_examined	Material examined. MALAYSIA • 1, 82 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.625 ° N, 100.394 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (84) 00002. • 3, 95 – 135 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (84) 00005.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDDFFE03F289E5EF48B325C.taxon	materials_examined	Material examined. MALAYSIA • 3, 225 – 240 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 4 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (84) 00008.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDDFFE03F289F62F31E3293.taxon	materials_examined	Material examined. MALAYSIA • 1, 79 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.625 ° N, 100.394 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (84) 00004.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDDFFE03F289BDFF223359A.taxon	materials_examined	Material examined. MALAYSIA • 1, 104 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.625 ° N, 100.394 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (84) 00003. • 1, 90 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (84) 00006.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDDFFE03CAA9B1DF6063692.taxon	materials_examined	Material examined. MALAYSIA • 5, 225 – 270 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (69) 00009.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDDFFE03F289C68F4513028.taxon	description	Figure 5 G	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDDFFE03F289C68F4513028.taxon	materials_examined	Material examined. MALAYSIA • 1, 186 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (107) 00001.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDDFFE03CAA9811F5593597.taxon	materials_examined	Material examined. MALAYSIA • 1, 95 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (69) 00016.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDDFFE03CAA992AF42934A0.taxon	materials_examined	Material examined. MALAYSIA • 1, 188 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 7 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (69) 00018.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDDFFE03CAA99C3F60233A4.taxon	materials_examined	Material examined. MALAYSIA • 2, 160 – 187 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 7 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (69) 00017.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDDFFE03CAA9EC7F52F315B.taxon	materials_examined	Material examined. MALAYSIA • 3, 120 – 128 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (69) 00010. • 5, 122 – 130 mm; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (69) 00010.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDDFFE03CAA9C6EF600305F.taxon	materials_examined	Material examined. MALAYSIA • 2, 303 – 311 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 4 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (69) 00021.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDDFFE03CAA9D63F4293F44.taxon	description	Figure 2 J	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDDFFE03CAA9D63F4293F44.taxon	materials_examined	Material examined. MALAYSIA • 1, 191 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 4 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (69) 00011.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDDFFE13F289D9DF7D23793.taxon	description	Figure 4 A	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDDFFE13F289D9DF7D23793.taxon	materials_examined	Material examined. MALAYSIA • 5, 259 – 300 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (76) 00001.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDCFFE13CAA99CDF42B33F2.taxon	materials_examined	Material examined. MALAYSIA • 2, 195 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (81) 00006.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDCFFE13CAA9EF4F7D332C4.taxon	description	Figure 3 N	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDCFFE13CAA9EF4F7D332C4.taxon	materials_examined	Material examined. MALAYSIA • 3, 169 – 180 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (81) 00007.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDCFFE13CAA9B68F53335C3.taxon	description	Figure 4 F	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDCFFE13CAA9B68F53335C3.taxon	materials_examined	Material examined. MALAYSIA • 5, 221 – 251 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (68) 00005. • 2, 184 – 202 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 4 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (68) 00006.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDCFFE13F2898C7F24833CA.taxon	description	Figure 3 H	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDCFFE13F2898C7F24833CA.taxon	materials_examined	Material examined. MALAYSIA • 3, 84 – 153 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (91) 00005. • 1, 140 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (91) 00006. • 5, 159 – 168 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (91) 00007.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDCFFE13F289EFFF45732DC.taxon	description	Figure 3 I	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDCFFE13F289EFFF45732DC.taxon	materials_examined	Material examined. MALAYSIA • 4, 74 – 83 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (91) 00004.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDCFFE13F28981DF2AA35A2.taxon	materials_examined	Material examined. MALAYSIA • 4, 190 – 196 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 4 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (91) 00008.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDCFFE13F289FE2F45631F1.taxon	materials_examined	Material examined. MALAYSIA • 2, 153 – 191 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (91) 00003.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDCFFE13CAA98E5F55D341A.taxon	materials_examined	Material examined. MALAYSIA • 1, 264 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (68) 00004.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDCFFE13CAA9FFAF5333193.taxon	materials_examined	Material examined. MALAYSIA • 3, 140 – 145 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 4 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (81) 00003. • 1, 162 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (81) 00004.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDCFFE13CAA9D15F3B236CA.taxon	materials_examined	Material examined. MALAYSIA • 5, 116 – 135 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (81) 00001. • 2, 102 – 135 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (81) 00002. • 2, 143 – 150 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (81) 00005. • 3, 80 – 104 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (81) 00008.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDCFFE23F289CCBF68B34F8.taxon	materials_examined	Material examined. MALAYSIA • 3, 59 – 67 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (30) 00002. • 5, 59 – 64 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (30) 00003. Identification. Small species of Ambassis (maximum TL about 8 cm); body elongated oval-shaped, laterally compressed; mouth terminal; interrupted lateral line; eye diameter larger than snout length; supraorbital spines 4 or 5; nasal spine present and well developed; posterior margin of preopercle serrated; single dorsal fin deeply notched; dorsal fin spines 7; anal fin spines 3; caudal fin deeply forked; body uniformly pale yellowish with scattered melanophores; fins mostly translucent, first 2 or 3 dorsal fin spines blackish. Tentatively identified as Ambassis vachellii using the identification key of Allen (1999). However, the tax- onomy of small species of Ambassis having more than one supraorbital spine needs revision. Ambassis vachellii can easily be distinguished from the two other species of Ambassidae occurring in Merbok river estuary by the unique combination of two characters: interrupted lateral line and 4 or 5 supraorbital spines. Ambassis vachellii is a typical brackish species and the most common species of Ambassidae in the Merbok river estuary and in other brackish environments in this region (e. g., Tongnunui et al. 2002). Its exact distribution in the Indo-West Pacific region is still unknown.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDFFFE23CAA998EF59031D2.taxon	materials_examined	Material examined. MALAYSIA • 3, 82 - 93 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (30) 00006. Identification. Moderate-sized species of Ambassis (maximum TL about 10 cm); body relatively deep, laterally compressed; mouth terminal; interrupted lateral line; eye diameter larger than snout length; only 1 supraorbital spine; nasal spine absent; single dorsal fin deeply notched; dorsal fin spines 7; the third one significantly longer; anal fin spines 3; caudal fin deeply forked; body uniformly pale greyish with scattered melanophores; fins mostly translucent, first 2 or 3 dorsal fin spines blackish. Ambassis interrupta can easily be distinguished from the two other species of Ambassidae occurring in the Merbok river estuary by the unique combination of two characters: interrupted lateral line and only one supraorbital spine. Ambassis interrupta is a typical brackish species and it occurs in other brackish environments in this region (e. g., Tongnunui et al. 2002). Its exact distribution in the Indo-West Pacific region is still unknown.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDFFFE23CAA9CD5F25D3422.taxon	description	Figure 3 O	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDFFFE23CAA9CD5F25D3422.taxon	materials_examined	Material examined. MALAYSIA • 2, 96 – 102 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (30) 00005. • 1, 71 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (30) 00004. • 2, 70 – 72 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (30) 00007. Identification. A moderate-sized species of Ambassis (maximum TL about 10 cm); body relatively deep, laterally compressed; mouth terminal; continuous lateral line; eye diameter larger than snout length; only 1 supraorbital spine; nasal spine absent; single dorsal fin deeply notched; dorsal fin spines 7; anal fin spines 3; caudal fin deeply forked; body uniformly pale greyish with scattered melanophores; fins mostly translucent, first 2 or 3 dorsal fin spines blackish. Ambassis macracanthus can easily be distinguished from the two other species of Ambassidae occurring in the Merbok river estuary by the unique combination of two characters: continuous lateral line and only one supraorbital spine. Ambassis macracanthus is a brackish species and it occurs in other brackish environments in this region (e. g., Tongnuinui et al. 2002). Its exact distribution in the Indo-West Pacific region is still unknown.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDFFFE23F289C01F450304E.taxon	description	Figure 4 D	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDFFFE23F289C01F450304E.taxon	materials_examined	Material examined. MALAYSIA • 5, 231 – 259 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (79) 00001.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDFFFE23F289DB6F2A93F44.taxon	materials_examined	Material examined. MALAYSIA • 1, 444 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (49) 00012.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDFFFE23F28999AF2AE32BD.taxon	description	Figure 3 R	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDFFFE23F28999AF2AE32BD.taxon	materials_examined	Material examined. MALAYSIA • 1, 144 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (71) 00002. • 1, 135 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (71) 00003. • 2, 265 – 283 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 4 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (71) 00004. • 2, 137 – 141 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (71) 00005.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDEFFE33CAA9EB7F42B324A.taxon	materials_examined	Material examined. MALAYSIA • 1, 126 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (48) 00009.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDEFFE33CAA9F7CF55B3F44.taxon	materials_examined	Material examined. MALAYSIA • 2, 130 – 144 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (48) 00010. • 2, 106 – 115 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (48) 00011. • 2, 129 – 140 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (48) 00012. Identification. A moderate-sized species of Johnius (maximum TL <30 cm); body elongated, laterally compressed; mouth inferior; snout blunded; no barbel on chin; anterior portion of dorsal fin with VIII or IX spines; posterior portion of dorsal fin with I spine and 25 or 26 branched rays; anal fin with seven branched rays; scale rows above lateral line to origin of dorsal fin 6; scale rows below lateral line to origin of anal fin 8; scales on upper part of body and head ctenoid; caudal fin S-shaped; body brown with pectoral and anal fins blackish.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDEFFE33CAA9A95F6913684.taxon	description	Figure 4 E	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDEFFE33CAA9A95F6913684.taxon	materials_examined	Material examined. MALAYSIA • 1, 295 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (49) 00007. • 2, 234 – 334 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (49) 00011.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDEFFE33CAA983BF695334D.taxon	materials_examined	Material examined. MALAYSIA • 1, 240 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (49) 00010. • 1, 273 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (49) 00006. • 1, 270 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 4 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (49) 00008. • 4, 234 – 265 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (49) 00009.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDEFFE33F289EAAF48532E6.taxon	description	Figure 4 H	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDEFFE33F289EAAF48532E6.taxon	materials_examined	Material examined. MALAYSIA • 3, 237 – 284 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (48) 00005.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDEFFE33F289F98F48A311A.taxon	materials_examined	Material examined. MALAYSIA • 5, 232 – 254 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (48) 00004.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDEFFE33F289CAFF2AF3050.taxon	materials_examined	Material examined. MALAYSIA • 1, 210 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 4 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (48) 00007.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFDEFFE33F289D56F48A3F44.taxon	materials_examined	Material examined. MALAYSIA • 3, 180 – 195 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 4 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (48) 00006.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD1FFEC3CAA9B93F4283523.taxon	materials_examined	Material examined. MALAYSIA • 1, 235 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 7.12.2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (74) 00008.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD1FFEC3CAA9845F42B3457.taxon	description	Figure 4 I	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD1FFEC3CAA9845F42B3457.taxon	materials_examined	Material examined. MALAYSIA • 2, 226 – 242 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 7.12.2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (74) 00009.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD1FFEC3CAA9969F6043329.taxon	description	Figure 4 J	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD1FFEC3CAA9969F6043329.taxon	materials_examined	Material examined. MALAYSIA • 5, 294 – 345 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (74) 00006.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD1FFEC3CAA9E5FF5C9327F.taxon	materials_examined	Material examined. MALAYSIA • 1, 220 mm; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (74) 00005.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD1FFEC3CAA9F01F42E32B5.taxon	materials_examined	Material examined. MALAYSIA • 5, 157 – 187 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (74) 00007.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD1FFEC3F289986F4C9311C.taxon	description	Figure 5 H	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD1FFEC3F289986F4C9311C.taxon	materials_examined	Material examined. MALAYSIA • 1, 125 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (56) 00006. Identification. Maximum TL about 300 mm (Froese and Pauly, 2020). Body elongate, dorso-ventrally compressed, head strongly flattened with eye partially di- rected upward; mouth large prognathous; teeth on vomer in two distinct patches; preopercular spines three, upper spine longest; spinous and soft dorsal fins well separated; backward directed spine on each lateral line scale; body above brownish, ventrally whitish, caudal fin brownish without clear pattern. Grammoplites scaber can be separated from Platycephalus indicus (Linnaeus, 1758) by the presence of spines on lateral line scales and the absence of pattern on the caudal fin. Grammoplites scaber is a common coastal species in this region which often enters brackish environments.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD1FFEC3CAA9AAAF425362A.taxon	materials_examined	Material examined. MALAYSIA • 5, 188 – 202 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (48) 00003.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD1FFEC3CAA9C0EF60130E5.taxon	description	Figure 4 L	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD1FFEC3CAA9C0EF60130E5.taxon	materials_examined	Material examined. MALAYSIA • 1, 139 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (53) 00002. • 4, 143 – 162 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (53) 00003.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD1FFEC3CAA9DDEF4573672.taxon	materials_examined	Material examined. MALAYSIA • 1, 156 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (62) 00006.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD1FFEC3F289B75F3AC3526.taxon	materials_examined	Material examined. MALAYSIA • 1, 211 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (62) 00004. • 1, 143 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.625 ° N, 100.394 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (62) 00007.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD1FFEC3F289859F484343C.taxon	description	Figure 4 M	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD1FFEC3F289859F484343C.taxon	materials_examined	Material examined. MALAYSIA • 3, 337 – 359 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 4 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (62) 00005.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD1FFED3F289CA2F62436AB.taxon	materials_examined	Material examined. MALAYSIA • 1, 225 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (56) 00007. Identification. Maximum TL about 1000 mm (Froese and Pauly 2020). Body elongate, dorso-ventrally compressed, head flattened with eye partially directed up- ward; mouth large prognathous; teeth on vomer in one slender transverse band; preopercular spines 2, lower spine longest; spinous and soft dorsal fins well separated; body brownish ventrally whitish, caudal fin with few irregular alternate black and white stripes and a large central yellow ocellus. Platycephalus indicus can be separated from G. scaber by the presence of only one transverse band of teeth on vomer, the absence of spines on lateral lines and the characteristic caudal marking pattern. Platycephalus indicus is a common coastal species in this region which often enters brackish environments (e. g., Tongnunui et al 2002).	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD0FFED3F289B5DF2AF357F.taxon	materials_examined	Material examined. MALAYSIA • 1, 84 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (50) 00014.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD0FFED3CAA9D9CF320362C.taxon	materials_examined	Material examined. MALAYSIA • 1, 80 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (50) 00012. • 1, 63 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (50) 00015.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD0FFED3CAA9CD4F42830EA.taxon	materials_examined	Material examined. MALAYSIA • 2, 58 – 70 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (50) 00013.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD0FFED3CAA9EC0F55D32F7.taxon	materials_examined	Material examined. MALAYSIA • 1, 99 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (60) 00002.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD0FFED3CAA9F88F42431EE.taxon	description	Figure 3 Q	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD0FFED3CAA9F88F42431EE.taxon	materials_examined	Material examined. MALAYSIA • 3, 234 – 278 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (60) 00003.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD0FFED3F289800F3DE35B1.taxon	materials_examined	Material examined. MALAYSIA • 1, 86 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (50) 00016.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD0FFED3F289937F2A834C4.taxon	materials_examined	Material examined. MALAYSIA • 3, 87 – 90 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (50) 00011.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD0FFED3F2899E5F2A333F4.taxon	description	Figure 4 B	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD0FFED3F2899E5F2A333F4.taxon	materials_examined	Material examined. MALAYSIA • 3, 90 – 97 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (50) 00017.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD0FFED3F289EF5F3AC3179.taxon	description	Figure 4 C	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD0FFED3F289EF5F3AC3179.taxon	materials_examined	Material examined. MALAYSIA • 5, 101 – 114 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (50) 00010. • 5, 65 – 76 mm; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (50) 00018.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD0FFED3CAA999BF42B331C.taxon	description	Figure 3 P	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD0FFED3CAA999BF42B331C.taxon	materials_examined	Material examined. MALAYSIA • 1, 103 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (47) 00005.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD0FFED3F289C4DF2AC302C.taxon	description	Figure 4 G	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD0FFED3F289C4DF2AC302C.taxon	materials_examined	Material examined. MALAYSIA • 5, 129 – 151 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 4 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (109) 00001.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD0FFED3CAA9811F6133442.taxon	materials_examined	Material examined. MALAYSIA • 1, 39 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.625 ° N, 100.394 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (115) 00001. • 1, 40 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.625 ° N, 100.394 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (115) 00002.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD0FFEE3F289D90F55F37B4.taxon	description	Figure 4 K	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD0FFEE3F289D90F55F37B4.taxon	materials_examined	Material examined. MALAYSIA • 1, 139 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (67) 00001.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD3FFEE3F289ACBF45D3687.taxon	description	Figure 5 L	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD3FFEE3F289ACBF45D3687.taxon	materials_examined	Material examined. MALAYSIA • 1, 266 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (40) 000010.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD3FFEE3F289839F38D32CD.taxon	materials_examined	Material examined. MALAYSIA • 1, 164 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (40) 00006. Identification. Maximum TL less than 200 mm (Dekkers 1975). Body stout, dorsal and ventral profiles con- vex; marking pattern irregular, complex; dorsum with two black blotches between head and dorsal fin: first large asymetric blotch between pectoral fins, second oval blotch in front of dorsal fin; side with small plain black spots and few large black circles with few large black ring spots: one below the base of dorsal fin, one at base of cau- dal fin and one below the second dorsal blotch; ventrolat- eral surface greyish; pectoral, dorsal and anal fins mostly plain greyish; caudal fin greyish with fainted crossbars. This specimen share marking pattern similarities with Dichotomyctere fluviatilis (Hamilton, 1822), which naturally occurs along the coasts of India, Bangladesh and Myanmar, in having two dorsal, black blotches between head and dorsal fin and the presence of distinct spots nearby the base of dorsal fin, at the base of caudal fin and below the second dorsal blotch (Dekkers 1975). Our specimen also presents difference such as the absence of a third transverse black blotch on the posterior part of the head. More specimens are needed to confidently resolve the taxonomic status of this species.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD3FFEE3CAA9E3CF6063398.taxon	description	Figure 5 D	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD3FFEE3CAA9E3CF6063398.taxon	materials_examined	Material examined. MALAYSIA • 3, 301 – 361 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (73) 00001.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD3FFEE3CAA9864F61234C8.taxon	description	Figure 5 A	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD3FFEE3CAA9864F61234C8.taxon	materials_examined	Material examined. MALAYSIA • 1, 155 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (110) 00001. • 5, 162 – 174 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (110) 00002.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD3FFEE3CAA9B35F7D136A4.taxon	materials_examined	Material examined. MALAYSIA • 5, 118 – 134 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.624 ° N, 100.395 ° E; 19 Apr. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (67) 00002.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD3FFEE3CAA9F48F53231DF.taxon	description	Figure 5 B	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD3FFEE3CAA9F48F53231DF.taxon	materials_examined	Material examined. MALAYSIA • 1, 94 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (88) 00004. • 1, 19 mm TL; Kedah State, Kampung Batu Lintang, Pompang Batu Lintang; 05.625 ° N, 100.394 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (88) 00006.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD3FFEE3CAA9CE0F6A63F44.taxon	description	Figure 5 C	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD3FFEE3CAA9CE0F6A63F44.taxon	materials_examined	Material examined. MALAYSIA • 1, 42 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (88) 00003. • 1, 131 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (88) 00005.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD3FFEF3F289FF3F4283672.taxon	materials_examined	Material examined. MALAYSIA • 2, 45 – 102 mm TL; Kedah State, Semeling, Semeling Bridge; 5.680 ° N, 100.470 ° E; 17 Jul. 2019; Sébastien Lavoué leg.; USMFC (40) 00011. Identification. Maximum TL less than 200 mm (Dekkers 1975). Body stout, dorsal and ventral profiles convex. Dor- sum and upper sides greenish gold with irregular rounded spots of diameter equal to or smaller than eye’s diameter, evenly scattered; ventrolateral surface light whitish; pectoral fins translucent, dorsal and anal fins plain; caudal fin with fainted crossbars (larger specimen). Dichotomyctere nigroviridis (until recently known as Tetraodon nigroviridis; see Igarashi et al. 2013 and Kottelat 2013 for current phylogenetic and nomenclatural information) is an important research model in genetics because of the small size and compact nature of its genome, leading to its complete sequencing early in the 21 th century (Jaillon et al. 2004). This species is known from this region since the work of Cantor (1849), who described Tetrodon simulans Cantor, 1849 which is currently considered as a junior synonym of D. nigroviridis.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD2FFEF3CAA9B74F7D13436.taxon	materials_examined	Material examined. MALAYSIA • 1, 67 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (40) 00005. • 2, 72 – 102 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (40) 00004. • 1, 154 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (40) 00007. • 3, 120 – 142 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (40) 00008.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD2FFEF3CAA9948F42B334D.taxon	materials_examined	Material examined. MALAYSIA • 1, 102 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (40) 00009.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD2FFEF3CAA9EB7F60132A0.taxon	description	Figure 5 M	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
3F11B974FFD2FFEF3CAA9EB7F60132A0.taxon	materials_examined	Material examined. MALAYSIA • 1, 136 mm TL; Kedah State, Merbok, Pompang Sungai Merbok; 05.664 ° N, 100.381 ° E; 6 Dec. 2018; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (61) 00002. • 1, 145 mm TL; Kedah State, Kuala Kedah, Kuala Muda Whispering Market; 05.578 ° N, 100.341 ° E; 19 Mar. 2019; Danial H. Zainal Abidin, Norli F. M. A. H. Alshari leg.; USMFC (61) 00003.	en	Zainal Abidin, Danial Hariz, Lavoué, Sébastien, Mohd Abu Hassan Alshari, Norli Fauzani, Mohd. Nor, Siti Azizah, A. Rahim, Masazurah, Mohammed Akib, Noor Adelyna (2021): Ichthyofauna of Sungai Merbok Mangrove Forest Reserve, northwest Peninsular Malaysia, and its adjacent marine waters. Check List 17 (2): 601-631, DOI: 10.15560/17.2.601, URL: http://dx.doi.org/10.15560/17.2.601
