Scopelengys tristis Alcock, 1890 .

Blackchin or Pacific Blackchin. To 20 cm (7.9 in) SL (Personal communication: Scripps Institution of Oceanography Fish Collection, La Jolla, California). Circumglobal; western Pacific Ocean north to Japan (Nakabo in Nakabo 2002) and Russian north-western Pacific Ocean (Orlov and Tokranov 2019); southern Bering Sea (Mecklenburg et al. 2002) and Gulf of Alaska (59°07’N, 146°55’W) (Stevenson et al. 2009) to northern Chile (30°S) (Kong and Meléndez 1991). Depth: minimum 400 m (1,312 ft) (Robertson et al. 2017); adults tend to occur deeper than 1,000 m (3,280 ft) (Nafpaktitis 1977) to 3,350 m (10,990 ft) or more, and juveniles (less than 10 cm) at 500–800 m (1,640 –2,625 ft) (Mecklenburg et al. 2002).