Salmo trutta Linnaeus, 1758

Iftime, Alexandru & Oţel, Vasile, 2025, An annotated systematical checklist of the Romanian ichthyofauna, Zootaxa 5654 (1), pp. 1-64 : 20

Salmo trutta Linnaeus, 1758

A native freshwater/anadromous species, found in mountain rivers and lakes in the whole Romanian Carpathian range ( Bănărescu 1964; Kottelat & Freyhof 2007; Cocan & MireȘan 2018; Nagy et al. 2023); and along all Romanian Black Sea waters and ascending the Danube (as the anadromous morph, often treated as Salmo labrax Pallas, 1811 : Bănărescu 1969 [as Salmo trutta labrax ]; Bănărescu 2005; Oțel 2007; Radu et al. 2008; Yankova et al. 2014; Cocan & MireȘan 2018; Lațiu et al. 2020; Niță et al. 2022; Năstase & Năvodaru 2023 [all as Salmo labrax ]). Freshwater potamodromous forms attributed to S. labrax were described from an intra-Carpathian drainage (BeliȘ-Fântânele dam lake, SomeȘul Cald river) (Lațiu et al. 2020); however, Nagy et al. 2023 only found S. trutta in intra-Carpathian areas.

Various relocations of native stocks and introduction of S. trutta stocks from Central/Western Europe have occurred ( Decei 1981; Popa et al. 2009—documenting the presence of Atlantic-lineage S. trutta ; Škraba Jurlina et al, 2020 and quoted literature—documenting the same in the Iron Gates dam lake, opposite the Romanian shore).

Kottelat & Freyhof 2007 admit both S. trutta and S. labrax for Romania. The two lineages hybridise both naturally and as a result of translocation (see, e.g., the discussions in Škraba Jurlina et al. 2020; Hashemzadeh Segherloo et al. 2021; Guinand et al. 2021; Lerceteau-Köhler et al. 2013; Englmaier et al. 2024 on this conundrum) leading to genetic homogenization/co-occurence.This, together with genetic structure (at least in some analyses, anadromous S. labrax appears closer to anadromous S. trutta than to montane freshwater S. trutta — Dudu et al. 2011, on Romanian samples; in other analyses it is vice versa—e.g. Kalayci et al. 2018), therefore, pending additional data, we group them as S. trutta (cf., e.g., Vasil’eva 2007; Parin et al. 2014; Kalayci et al. 2018; Nagy et al. 2023).