T. HUBENOVA and A. ZAIKOV
Institute of Fisheries and Aquaculture, BG – 4003 Plovdiv, Bulgaria
HUBENOVA, T. and A. ZAIKOV, 2013. Prey size selectivity in pike (Esox lucius L.) fed with crucian carp (Carassius auratus gibelio L.). Bulg. J. Agric. Sci., Supplement 1: 51–54
The object of the present study was to investigate the prey size selectivity by pike Esox lucius L. in controlled conditions. The experiment was carried out with 6 pike with body weight between 613–676 g. Each of them is stocked individually in cage with 20 small and 20 large specimens of crucian carp Carasius auratus gibelio. The investigation shows that in the specific conditions of the experiment pike prefers to eat large prey and the results are in conformity with optimal foraging theory. In the end of the experiment in all of the cages the large preys were eaten first. Established selectivity index is as follows: small prey -0.088; large prey +0.094.