G. Zhelyazkov* Department of Biology and Aquaculture, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria Abstract. The aim of study is to determine the effect of two stocking densities on some hydrochemical parameters and growth traits in cultivation of perch /Perc

I. Sirakov, Y. Staykov, E. Ivancheva, G. Nikolov, A. Atanasov Abstract. The relationships among 15 morphometric measurements and carcass weight in European perch (Perca fluviatilis) were examined in connection with sexual dimorphism. The determinated sex ratio was 1:1.3 in the advanta