Investigation on Predator/Prey Body Weight and Length Proportions in Pike Esox lucius L.

A. ZAIKOV, T. HUBENOVA and P. VASILEVA
Institute of Fisheries and Aquaculture, Varna, Branch Plovdiv, BG - 4003 Plovdiv, Bulgaria

Abstract

ZAIKOV, A., T. HUBENOVA and P. VASILEVA, 2006. Investigation on prdator/prey body weight and body length proportions in pike Esox lucius L. Bulg. J. Agric. Sci., 12: 203-207

The object of the present study was to investigate pike Esox lucius L. cannibalism and specially the ratio of body weight and length between predator and prey. The investigation was carried out with 81 pike fingerlings with an average body weight of 2.24+0.56 g and a total body length of 7.14+0.54 cm. The same prey body parameters were as follows: 0.56+0.13 g and 4.18+0.51 cm. The obtained results indicated that the prey took 13.64 to 43.64% from the predator's body weight and 42.35 to 73.44% from its total body length. The minimal body weight and body length of pike, in which cannibalism was established were 1.46 g and 6.1 cm respectively. The co-storage of pikes with different body size creates conditions for cannibalistic behavior, which can cause considerable losses.

Key words: pike, cannibalism, predator, prey, body length, body weight