1. BC Hydro, Fish and Aquatics 601 18th Street Castlegar British Columbia V1N 2N1 Canada
2. U.S. Fish and Wildlife Service, Bozeman Fish Technology Center 4050 Bridger Canyon Road Bozeman Montana 59715 USA
3. Ecometric Research, Inc 3560 West 22nd Avenue Vancouver British Columbia V6S 1J3 Canada
4. U.S. Geological Survey, Southwest Biological Science Center Grand Canyon Monitoring and Research Gemini Drive Flagstaff Arizona 86001 USA