The studies of Balarin and Haller (1982) showed that fry of tilapia required a diet ranging between 35 and 50%CP, and 5-25 g fish between 25 and 35% CP. Tacon (1987) reported dietary protein levels varying from 42% for fry to 35% for growing adults of omnivorous fish species. Our results show a nore accurate description of dietary CP needs for different life history changes,as we tested the possible variations within these ranges(25-45%) . Variataons in dietary CP needs at different life history stages. EI-sayed ana Teshina(1991) found tnat dietary protein requirements decreased with increasing fish weight and age.Both in fingerling and advanced juvenile of Nile tilapia,excess protein could not be utilized efficiently and might have been used for energy.