1. Aquaculture Research Institute, Department of Fish and Wildlife Sciences, University of Idaho, 3059F National Fish Hatchery Road, Hagerman, Idaho 83332, USA
2. U.S. Department of Agriculture, Agricultural Research Service, Catfish Genetics Research Unit, Post Office Box 38, Stoneville, Mississippi 38776, USA
3. Aquatic Ecology Laboratory, The Ohio State University, 1314 Kinnear Road, Columbus, Ohio 43212-1156, USA