A 16 week feeding trial was conducted in aquaria with all-male sex-reversed Nile tilapia Oreochromis niloticus (2.79±0.5 g). Five isonitrogenous (25% protein) and isocaloric (288 Kcal metabolizable energy/100g) diets were formulated to replace 0, 25, 50, 75 and 100% of fish meal protein with soybean meal protein. The experimental diets were tested in two replicates to evaluate the effects of replacing fish meal protein (FMP) with soybean meal protein (SMP) on growth, feed utilization, carcass traits and proximate analysis of all-male sex-revered Nile tilapia O. niloticus. After 16 weeks, fish fed a diet with 100% FMP had a significant (P