Record of the brown trout Salmo trutta L., 1758 in the main riverbed of the Serbian part of the Danube River

Abstract

This study reports on the occurrence of brown trout individuals along the main bed of the Danube River in its Serbian portion. The question whether they are indigenous Salmo labrax whose dispersal area corresponds to this locality was approached by using the two specific genetic markers, mtDNA Control Region (CR) and nuclear lactate dehydrogenase gene (LDH). Two brown trout individuals undoubtedly of Atlantic lineage,that is not of the S. labrax species, had the haplotype At1d of the CR mtDNA know as one of the four At haplotypes identified in Austrian hatcheries. Results from the nuclear LDH gene analysis also confirm the Atlantic origin of brown trout individuals.