1. Department of Food Hygiene and Control, Faculty of Veterinary Medicine, Suez Canal University,41522 Ismailia, Egypt
2. Department of Food Hygiene and Control, Faculty of Veterinary Medicine, Tripoli University,13662 Tripoli, Libya
3. Department of Fish Health, World Fish Center, Regional Research Center for Africa and West Asia, Abbassa, Sharkia, Egypt
4. Department of Food Hygiene and Control, Faculty of Veterinary Medicine, Cairo University, 12211 Giza, Egypt