The spring and summer nutrition of the 300-500 g pike-perch (Lucioperca lucioperca l.) in Lake Balaton in 1968. II. The calculation of consumption, daily and monthly rations

Biró, Péter (1969) The spring and summer nutrition of the 300-500 g pike-perch (Lucioperca lucioperca l.) in Lake Balaton in 1968. II. The calculation of consumption, daily and monthly rations. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 36. pp. 151-162. ISSN 0365-3005

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Abstract

Author established on the basis of six monthly experimental periods that the 300-500 g pike-perch inhabiting Lake Balaton feed most intensively in July: stomach evacuation occurs every day and a half meaning that the animal is capable to consume food 19 occasions per month. The total weight of stomach contents of feeding pike-perch was 410 g in June, the lowest value, while in March and July it was 1265 and 1745 g, respectively, having been the highest value. The nutritional average falling to one pike-perch is only informative in nature because great differences occurred when compared with the calculated daily consumption. The daily and monthly consumption of one pike-perch is small, in an average it only yields 3.4 g and 52.5 g. The quantity of food consumed over a period of six months was 315 g, which is 80.73% of the body weight. On the basis of the data obtained it became clear that the food turnover of the fourth grade pike-perch inhabiting Lake Balaton is rather low.

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