1. A.R. Black Idaho Cooperative Fish and Wildlife Research Unit, University of Idaho, 875 Perimeter Drive MS 1141, Moscow, Idaho 83844
2. J.D. Walrath Wyoming Game and Fish Department, 351 Astle Avenue, Green River, Wyoming 82935
3. M. Willmes National Marine Fisheries Service, Southwest Fisheries Science Center, 110 McAllister Way, Santa Cruz, California 95064Institute of Marine Sciences, University of California Santa Cruz, 115 McAllister Way, Santa Cruz, California 95064
4. M.C. Quist U.S. Geological Survey, Idaho Cooperative Fish and Wildlife Research Unit, University of Idaho, 875 Perimeter Drive MS 1141, Moscow, Idaho 83844