الفهرس 
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Abstract
This study was carried out to evaluate the use of different levels of licorice roots(Glycyrrhizaglabra), rocket leaves(Erucasativa) and theirmethanolic extracts supplemented to the diets as a natural feed additives on growth performance, feed utilization, whole-body composition, blood parameters, innate immunity and cost-benefit analysis of all-male Nile tilapia, Oreochromisniloticus fingerlings. Fourteenisonitrogenous (30% crude protein) and isocaloric (4.40 kcal/g) diets were formulated to contain 0.0 (control), 0.5, 1.0, and 1.5%(for each licorice roots and rocket leaves), 0.04, 0.08 & 0.12 for methanolic extract of licorice roots and 0.06, 0.12 &0.18 formethanolic extract of rocket leaves.Fish (5.05 ±0.004 g) were distributed at a rate of 15 fish per 140-L aquarium in triplicates and fed tested diets at a rate of 5% at the first four weeks and 3% of live body weight at the rest of twelve weeks.Daily feed amount was calculated according to the new fish weight and adjusted every 14- days. Licorice roots, Rocket leaves and theirmethanolic extracts supplementation enhancement fish growth over the control diet and the highest fish performance was obtained at 0.5% for licorice roots, 0.04%formethanolic extract of licorice roots, 1% for rocket leaves and 0.12% for methanolic extract of rocket leaves levels.