This study was conducted to investigate the freshwater migration patterns of Black Sea trout (Salmo trutta labrax), which distribute in the North-eastern coastal region of Black Sea, between June 1998-July 2001. Physical and chemical features of streams, which are mostly favourable for entrance of intensive Black Sea Trout, were determined and environmental effect on fish stocks and lifecycles were observed. During spring and winter periods Black Sea Trout inhabit near to sea. During summer, under the effect of water temperature, adult fish move to upstreams and branches for reproduction and other fish for nutrition. In autumn especially adults show a migration pattern by the aim of reproduction. Intense nutritional activities in coastal regions are finalized by the smoltification and migration to the sea by the effect of different (debated) factors. Length and weight of fario ecotype exhibited significant differences, seasonal distribution among stations (P<0,05), downstream and upstream regions (P<0,01).