1. Department of Pathology, Faculty of Veterinary Medicine, Suez Canal University, Ismailia, Egypt
2. Department of Aquatic Animal Medicine & Management, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt
3. Department of Fish Health and Management, central laboratory for Aquaculture Research, Agriculture Research center, Sharqia, Egypt
4. Department of Aquaculture Diseases Control, Fish Farming and Technology Institute, Suez Canal University, Ismailia, Egypt