THE EFFECT OF STOCK DENSITY ON THE SURVIVAL, CANNIBALISM AND GROWTH OF SUMMER FRY OF EUROPEAN PIKEPERCH (Stizostedion lucioperca L.) FED ARTIFICIAL DIETS IN CONTROLLED CONDITIONS

Abstract

Summer fry of pikeperch from the fish ponds was reared in controlled conditions on artificial diets in three variants of fish densities (0.6, 1.2 and 1.8 g/dm³). Fish survival during a 4-week period of rearing ranged from 57.10 to 59.16 %. Losses were observed only in the first two weeks of rearing. The differences in natural losses and those caused by cannibalism depended in a significant way on fish densities.