Homing of tagged sea trout (Salmo trutta L.) smolts released into polish rivers

Abstract

About 183 000 sea trout smolts were tagged in 1961-1986 and released into the Vistula River system, the Pomeranian rivers, and the Gulf of Gdańsk. The Vistula River stockings showed the highest percentage of recaptures in rivers. Almost all fish were caught in the Vistula River system. A lot of sea trouts from stockings of the Pomeranian rivers went astray and were recaptured either in the Vistula River or in the Pomeranian rivers. It seems that local Pomeranian sea trout may be a mixture of populations stemming from the neighboring rivers. This concerns in particular the cases when the share of smolts from stocking is very high.