الفهرس 
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Abstract
The present study was carried out to investigate the effect of using leaf protein concentrates of some plants in Nile tilapia diet on growth performance, feed utilization, body composition, and economic efficiency for 84 days. The first experiment studied the effects of incorporation of carrot leaf protein concentrate (CLPC) and sugar beet leaf protein concentrate (SPLC) at level of 50 to 100% instead of soybean meal in diets for Nile tilapia. The second experiment studied the effects of incorporation of soybean meal or a mixture of carrot and sugar beet leaf protein concentrates at levels 25, 50, 75, and 100% instead of fish meal in diets for Nile tilapia. The results of first experiment revealed that growth performance parameters of Nile tilapia significant (P<0.05) decreased as the replacement of soybean meal with the leaf protein concentrations. But, the same parameters insignificantly affected in fish group fed the diets replaced with 50% SPLC and 100 CLPC compared to the control diet. Fish group fed 50% CLPC, 100% CLPC and 50% CLPC + 50% SPLC recorded the best values of feed conversion. All blood biochemical and hematological parameters of Nile tilapia insignificantly affected with the replacement of soybean meal with the leaf protein concentrations. The results of the second experiment indicated that partial replacement of fish meal with soybean meal or the leaf protein concentrate insignificantly affected growth parameters. Also, when compared soybean meal versus the leaf protein concentrate did not show any significant effect on growth parameters. Feed conversion of Nile tilapia improved in fish 75% LPC, 75% SM, 25% LPC and 25% SM groups than the other groups. Nile tilapia fed on diet partially replaced 75% of fish meal with leaf protein concentrate (75% LPC) recorded the best feed conversation. Feed cost of Nile tilapia decreased with the replacement of fish meal with soybean meal or the leaf protein concentrations. The feed cost decreasing ranged between 30 and 49%. Replacement of fish meal with the 100 or 75% LPC recorded the best final margin and relative margin than the other groups. It could be concluded that, CLPC and SPLC could replace 50 and 100% respectively of soybean protein in Nile tilapia diets without adverse effects on the weight gain, feed conversion, and blood parameters. Also, a mixture of CLPC and SPLC or soybean meal could be partially (75%) replace fish meal protein in Nile tilapia diets without adverse effects on the weight gain or feed conversion, and blood parameters.