1. Department of Fish Biology and Ecology, Central Laboratory for Aquaculture Research, Sharqia, Egypt
2. Department of Aquaculture and Fisheries Management, University of Ilorin, Ilorin, Nigeria
3. Department of Veterinary Pathology, University of Ibadan, Ibadan, Nigeria
4. Department of Aquaculture and Fisheries Management, University of Ibadan, Ibadan, Nigeria