1. Fish Ecology and Conservation Physiology Laboratory, Department of Biology; Carleton University; 1125 Colonel By Drive Ottawa ON K1S 5B6 Canada
2. Department of Biology; College of The Bahamas; P. O. Box F4912 Freeport The Bahamas
3. Department of Natural Resources and Environmental Sciences; University of Illinois at Urbana-Champaign; 1102 S. Goodwin Ave. Urbana IL 61801 U.S.A.