The present study was designed to evaluate the use of Duckweed (Lemna minor) as are placement of soybean
meal Protein 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 were 25, 50, 75 and
100% of the soybean meal protein diet in addition to control diet. The experiment lasted for 56 days. The best final
weight gain, specific growth rate, survival rate and feed utilization (FCR, FE and PER) were significantly (p<0.05)
higher for group of fish fed on diet replaced with 25% Duckweed from Soybean 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 Soybean meal protein diet compared to those on the experimental groups. In conclusion, the study
indicates that replacement soybean meal protein with 25% duckweed was the best in terms of growth performance and
feed utilization.