Khattab et al.(2000) studied the optimum dietary protein level for three Nile tilapia strains of the same weight class (12 g) collected from different locations in Egypt and found that optimum dietary protein level ranged from 27 to 37% Such variations in optimum dietary protein requirements for tilapia growth might be due to the variation in stocking density. hygiene.and/or environmental conditions in their natural environments'In variability was controlled and the effect of protein in the diet was not confounded by other factors.feed utilization was significantly sffected by protein level and fish weight but not their interaction. FCR increased with fish weight and coincided with previously published ranges for Nile tilapia (Siddiquiet at .,1988;Ai-Hafedh,1999;Abdelghany,2000;Khattab et al.,2000).