الفهرس 
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Abstract
The present study was designed to evaluate the use of Duckweed (Lemna minor) as a replacement of soy beanProtein for Nile tilapia (Oreochromis niloticus) fingerlings. Duckweed was incorporated into four isonitrogenous (30 % crude protein) and isocaloric diets (gross energy 448 Kcal/100g). The replacement levels were25, 50, 75 and 100% of the soy protein diet in addition to control diet. The experiment lasted for 56 days. The best final weight gain, specific growth rate, protein efficiency ratio and survival rate of fish were significantly (p<0.05) higher for group of fish fed and feed utilization (FCR, FE and PER) on diet replaced with 25% Duckweed from Soy beanbean protein diet . The highest feed conversion ratio was obtained for group of fish fed on diet replaced by 100 % Duckweed . There was a significant difference (p<0.05) in protein and lipid in carcass proximate composition of the fish feed on diet replacement with 25% Duckweed from Soy bean protein diet compared to those on the experimental groups.In conclusion this study indicate that replacement soybean protein with 25% duckweed was the best in terms of growth performance, feed utilization and economic analysis.
Key Words
Duckweed (Lemna minorreplacement , , growth performance, feed utilization, carcass composition,Nile Tilapia.