EFFECT OF WINTER FEEDING ON THE RATE OF GROWTH, FOOD CONVERSION AND SURVIVAL OF NILE TILAPIA (OREOCHROMIS NILOTICUS L.) AND COMMON CARP (CYPRINUS CARPI° L.) IN EGYPT

Document Type : Original Article

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Central Laboratory for Fish Research, Agricultural Research Centre, Giza, Egypt

Abstract

The study demonstrated positive benefits of winter feeding. Fish without feeding in winter lost significant by (P < 0.05) body weight. Fish received feed at either 1% or 2% of body weight gained substantial weights. Fish demonstrated poor food conversion rates (FCR) reduced growth rates, but with good survival rates. Fish producers addressing spring markets could increase weight gain and improve the FCR by ad­justing overwinter feeding. The routine metabolism was determined for both fish species. The mean values for the entire period of the experiment were 64.7 cal/ fish/day for Oreochromis niloticus, and 247.5 cal/fish/day for Cyprinus carpio. The metabolic rate of a fish of lg (The specific routine metabo­lism) was determined. The mean values were 4.92 cal/day and 11.87 cal/day for Nile Tilapia and common carp, respectively. The dietary met­abolizable energy required for maintenance of a fish of 1 g was deter­mined. The mean values were 9.84 cal/day, and 23.74 cal/day for Nile Tilapia and common carp, respectively.

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