Age structure of the smolts of the migratory morphotype of the brown trout (Salmo trutta m. trutta L., 1758) from the Gowienica River

Abstract

The present paper shows the age, mean length, and weight of smolts of the migratory morphotype of the brown trout, grown in the drainage area of the Gowienica River (Pomera nia). The above parameters are given separately for both sexes and all age groups. Because the scales of the smolts were in the period of annual ring formation, the age determination was preceded by counting the annual rings and analyzing the edge increments. The study was based on a total of 277 smolts ac quired in four fishing seasons covering the years of