الفهرس 
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Abstract
ABSTRACT : This study included two parts; studying the effect of some food additives on some biological parameters of mulberry silkworm (Bombyx mori L.) and the effect of feeding silkworm pupae (SWP) and silkworm feces (SWF) on growth, haematological and biochemical parameters of Nile tilapia fish (Oreochromis niloticus). Firstly, the effect of some oils (basil, mint, olive, thyme and citronella) at (0.125, 0.25, 0.5 and 1%), lemon and orange juices (1, 2, 4 and 8%), synthetic vitamin C (0.125, 0.25, 0.5 and 1%) and red beet (12.5, 25, 50% and 100%) as food additives on mulberry silkworm were evaluated. Results showed that all oils increased significantly the egg numbers. Thyme oil at 1% gave the best biological parameters followed by peppermint at 0.5 and 1%. Both lemon and orange juices and heated red beet showed improvement in the biological parameters. Also, vitamin C appeared improvement in 0.5% treatment without significance. The second part conducted to determine the effect of replacing fishmeal with SWP and SWF at 30, 40 and 50% for each on growth, feed utilization, haematological and biochemical parameters of Nile tilapia fingerlings. A total 210 Nile tilapia fingerlings were randomly distributed into seven experimental groups triplicate and were fed daily at a rate of 3% of fish live body weight through 11 weeks experimental period. Results showed significant increase on the final body weight, total weight gain, average daily gain specific growth rate, feed intake, protein efficiency ratio, protein productive value at 40% silkworm pupae, while silkworm feces decreased without significant. Haematological parameters showed insignificant differences among all treatments except at RBCs, Hb and PCV which were significantly increased. Biochemical analyzes and phagocytosis did not show any negative effects on the fish. In conclusion fishmeal can be replaced with 40% SWP in diet formulation of Nile tilapia fish.