KOMUNIKATY RYBACKIE

Nr 2 (121)/2011, 1-6

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SEFECTS OF STOCKING BROWN TROUT, SALMO TRUTTA M. FARIO L., INTO RIVERS IN KASHUBIAN POMERANIA AND SUWAŁKI

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.