EFFECT OF FEEDING FREQUENCY ON FOOD-CONSUMPTION, GROWTH, SIZE VARIATION, AND FEEDING PATTERN OF AGE-0 HYBRID SUNFISH

Four treatment groups of age-0 hybrid sunfish (female green sunfish Le pomis cyanellus x male bluegill L. macrochirus) were fed to satiation at one of four frequencies (one, two, three or four meals per day) for 30 days. Fish fed three and four times daily showed the greatest cons umption and growth rates; food conversion ratios did not differ among the four treatments (P > 0.05). Because growth and food conversion wer e not enhanced when feeding was increased from three to four times dai ly, the optimal feeding frequency for growth was considered to be thre e times per day. However, the extent of inter-individual size variatio n (% change in CV) declined with increasing number of daily feedings ( P < 0.05), suggesting that more frequent feeding may produce fish of m ore uniform sizes. Daily feeding patterns also changed in response to feeding frequency, indicating that when fish are fed at a particular f requency, knowledge of feeding pattern is necessary so that appropriat e food amounts can be supplied at each provisioning. Our results sugge st that an optimal feeding frequency should be determined not only on the basis of growth and food conversion efficiency, but also according to influences of daily feeding pattern and the desire to achieve size uniformity. (C) 1998 Elsevier Science B.V. All rights reserved.