Daily foraging cycle, and daily food ration of roach Rutilus rutilus (L.) in Bachotek Lake (Brodnickie Lakeland) in spring

Abstract

Food composition, and feeding intensity of roach in a daily cycle was studied. Daily food ration, calculated according to Thorpe (1977) for roach of average body weight 6.44 g, at average water temperature 14.1^oC, was equal to 2.5% of fish body weight.