1. Clinical Division of Fish Medicine, University of Veterinary Medicine, Vienna, Austria.
2. Zoology Department, College of Science, King Saud University, Riyadh, Saudi Arabia.
3. Zoology Department, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt.
4. Department of Zoology and Entomology, Faculty of Science, Helwan University, Cairo, Egypt.