Coregonus maraenoides Polyakov, 1874

Iftime, Alexandru & Oţel, Vasile, 2025, An annotated systematical checklist of the Romanian ichthyofauna, Zootaxa 5654 (1), pp. 1-64 : 19

Coregonus maraenoides Polyakov, 1874

A non-native freshwater species, deliberately introduced (see Bănărescu, 1964 for its Lake Peipsi origin) and grown in aquaculture, also introduced in a few montane lakes and reservoirs (same as the previous species); it is unclear whether it survives, it certainly did so until 2010 in Vidraru lake ( Iftime & Iftime 2021, and sources quoted therein).

An undetermined Coregonus species, most likely one of the two above, still occurs in the Tarnița reservoir area ( Nagy et al. 2023). The long-time persistence of such populations (Vidraru, Tarnița) likely implies reproduction.

Fam. Thymallidae

Thymallus thymallus (Linnaeus, 1758)

A native freshwater species, found in large mountain rivers, formerly across much of the Romanian Carpathian range; nowadays the range has contracted, but reintroduction has also taken place ( Bănărescu 1964; Bănărescu 2005; Cocan & MireȘan 2018; Polyák et al. 2022; Nagy et al. 2023).

Fam. Salmonidae

Hucho hucho (Linnaeus, 1758)

A native freshwater species, found in large mountain rivers, formerly across much of the Romanian Carpathian range, including the Danube in the Iron Gates area; nowadays very much reduced, native populations still persist in the MaramureȘ area (Tisza, ViȘeu, Vaser, Ruscova and FrumuȘeaua rivers); many attempts at reintroduction have been made, but apparently with success only in the upper MureȘ area ( Bănărescu 1964; Bănărescu 2005; Cocan & MireȘan 2018; Curtean-Bănăduc et al. 2019; Nagy et al. 2023). Not found by Polyák et al. 2022 in their sampling of the Tisza catchment, which included all MaramureȘ rivers listed above.