Joanna Grudniewska, Krzysztof Goryczko, Andrzej Witkowski, Jacek Kozłowski, Katarzyna Stańczak, Krzysztof Kozłowski, Grzegorz Gęsiarz, Robert Stabiński
ABSTRACT. The effectiveness of stocking brown trout summer fingerlings (0.5-1.3 g) into six moraine Pommeranian rivers was evaluated. Three groups of experimental fish were marked with alizarine red S to enable their identification during autumn and spring monitoring with electrofishing. The results indicated that stocking was more effective when done with summer fingerlings than one- year-old fish. In the three investigated rivers stocking resulted in 3.5 to 13.5 young-of-the-year trout increment. In two cases the share of stocked fish was lower than these from natural spawning.
Keywords: brown trout, fry (0+), stocking, effectiveness, survival, moraine rivers,
Przyjęto po recenzji 05.04.2011 r.