1. 1 Department of Animal Production, Faculty of Agriculture , Damietta University , Damietta, P.O. Box 34517 , Egypt
2. 2 Department of Fish Nutrition, Sakha Research Unit , Central Laboratory for Aquaculture Research (CLAR) Abbassa , Sharkia, Agriculture Research Center (ARC), P.O. Box 12619 , Giza , Egypt
3. 3 Department of Fish Production, Faculty of Agriculture , Al-Azhar University , Cairo , P.O. Box 11651 , Egypt
4. 4 Department of Fish Genetics and Breeding , Central Laboratory for Aquaculture Research (CLAR), Abbassa, Sharkia, Agriculture Research Center (ARC) , Giza , P.O. Box 12619 , Egypt
5. 5 Department of Animal Production, Faculty of Agriculture , Zagazig University , Zagazig , P.O. Box 44519 , Egypt