Al-Hafedh YS ; Ali SA ;

Journal of Applied Ichthyology vol. 20 (3)   pp. 225-227, 1 Jui 2004

Summary Daily feeding rates of 0, 2, 4, 6, 8 and 10% of body weight to juvenile (average weight 0.64-65.4 g) catfish, Clarius gariepinus, for 112 days had significant effects on survival, cannibalism, growth and feed conversion ratio (FCR). Survival was significantly higher in fish fed at 6-10% of body weight than those fed at 2-4%. Mortality was mainly caused by cannibalism, being significantly higher in underfed (2-4%) fish than in fish fed at the 6-10% level. A feeding level above 6% did not further reduce cannibalism. The best growth performance was recorded for the fish fed at 8-10% body weight, followed by the fish fed at 4-6%; poorest growth was found for those fed at the 2% level. FCR significantly increased from 2-4% (FCR, 1.14-1.13) to 6, 8 and 10% (FCR, 1.37, 2.18, 2.98, respectively). The results of this study suggest that the optimum feeding rate of juvenile catfish with an average initial weight of about 0.64 g and grown to a size of about 64 g is at 6% body weight per day

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