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The purpose of the present study was to determine the influence of three diff e rent feeding methods on the growth performance and survival rate of European perch ( Perca fluviatilis L. ) cultivated in recirculating system during its transition from natural food to pelleted feed. During the transition from natural food to formulated diet, the feed of the fish from group A was supplemented by chopped earthworms, while that of group B - with frozen bloodworms. The perch from group C were fed dough-like feed, obtained by adding of liquid betaine. The final body weight of the perch from the three groups was as follows: A - 18.99 ±5.73 g, B - 18.49 ±5.30 g and C - 18.06 ±5.14 g , as the differences were not significant (P>0.05). Similarly, in regard to the survival rate, the groups did not differ. The FCR in the group fed earthworms was 1.05 ±0.02 and it was lower than that of the groups receiving bloodworms and betaine in the diet by 1.11 ±0.02 and 1.30 ±0.06 respectively. Significant influence of the method of feeding (Р≤0.001) was found in regard to this trait .

aquatic research

EFFECT OF DIFFERENT DIETS ON GROWTH PERFORMANCE AND SURVIVAL OF EUROPEAN PERCH (Perca fluviatilis L.) CULTIVATED IN RECIRCULATING SYSTEM DURING TRANSITION FROM LIVE FOOD TO FORMULATED FEED