Acta Ichthyologica et Piscatoria 29(1): 63-82, doi: 10.3750/AIP1999.29.1.06
Age structure of the smolts of the migratory morphotype of the brown trout (Salmo trutta m. trutta L., 1758) from the Gowienica River
expand article infoO. Antoszek
Open Access
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 (Pomerania). 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 analysing the edge increments. The study was based on a total of 277 smolts acquired in four fishing seasons covering the years of 1980, 1982, 1983, and 1984.