الفهرس 
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Abstract
Tilapia is the common name of over 300 species of perch like fishes of family Cichlidae native to fresh waters of tropical Africa (Trewavas, 1983; Stiassny 1991). Tilapias are the major protein source in developing countries. Their fast growth rate and high disease resisting character give them the ability to survive in crowded media with low oxygen tension. In addition, their acceptability in markets recommends them as the most potential group of fishes for aquaculture as they are considered as the prime domesticated teleosts.