1. School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn,AL 36849, USA
2. Biosystems Engineering Department, Auburn University, Auburn, AL 36849, USA
3. Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, USA
4. Department of Veterinary Hygiene and Management, Faculty of Veterinary Medicine, Cairo University, Giza 12211, Egypt
5. Department of Biological and Environmental Sciences, Troy University, Troy, AL 36082, USA