الفهرس 
ContentsOnly 14 pages are availabe for public view
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Abstract
Two species of fishes were considered in this study one of them from the fresh water fishes tilapia nilotica and the other from marine fishes sparus auratus tilapia is a member of avery large family cichlidae abounding in Africa including Madagascar and extending to Syria india and cylon in asia it is known also in central and south America.