Prey Selectivity in One-Summer-Old Wels (Silurus glanis L.) Fed with Carp (Cyprinus carpio) and Topmouth Gudgeon (Pseudorasbora parva)

Institute of Fisheries and Aquaculture, BG-4003 Plovdiv, Bulgaria


ZAIKOV, A., T. HUBENOVA and I. ILIEV, 2008. Prey selectivity in one-summer-old wels (Silurus glanis L) fed with carp (Cyprinus carpio) and topmouth gudgeon (Pseudorasbora parva). Bulg. J. Agric. Sci., 14: 238-243

The aim of this study was to determine the selectivity index in one-summer-old wels (S. glanis). The experiment was carried out under controlled laboratory conditions, in the course of 36 days, in 10 tanks. One wels (S. glanis), 5 carps (C. carpio), and 5 topmouth gudgeons (P. parva) were placed in each tank. As a result of the experiment, positive values of the selectivity index were established, as regards P. parva (+0.2575) and a negative value as regards C. carpio (-0.1163). Data shows that when the wels is fed with carp and topmouth gudgeon it demonstrates greater affinity towards the second species.

Key words: wels, prey, selectivity index

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