Growth rate, condition and fecundity of the fished population of vendace (Coregonus albula L.) from the Gorzynskie lake (Miedzychod district)

Summary. The objective of studies carried out in 2007 was the investigation of the most important biological features of the fished vendace population from the Gorzynskie lake lying in the Miedzychod-Sierakow Lakeland. In order to realize this goal, the growth rate, fish condition and fecundity of the fish were studied. Typical fishing equipment was used. In the catches, two-year-old individuals were dominated. Vendace from the studied lake belongs to the group of fish with a quick growth reaching in their third year of life the total length averaging to about 22.01 cm. The mean value of Fulton’s condition coefficient in three measurement periods showed 0.902, 0.945 and 0.800 coefficient values, respectively. Vendace from the Gorzynskie lake is characterised by a high fecundity as compared with the majority of other lakes.