الفهرس 
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Abstract
Studying the effect of different initial body weights and feeding rates on feed and nutrients utilization, growth performance, body composition, and economic production of mono-sex all males Nile tilapia and thin-lipped mullet (Tobara) under mono-culture condition. Two mono-culture experiments were undertaken on mono-sex all males Nile tilapia (Oreochromis niloticus) and thin-lipped mullet (Mugil capito/Liza ramada, Bouri tobara, Tobara) in eighteen (nine / fish species, three initial weights x three feeding levels) Hapas stocked in an earthen pond for five months. Fish fed a commercial diet (30% crude protein). The obtained results revealed that both variables (initial body weight and feeding rate) affected all criteria measured including feed and nutrients utilization, growth performance, chemical composition and the cost of food required to produce one Kg body gain. All studied variables had been affected each of the studied criteria.