1. U.S. Fish and Wildlife Service, Utah Cooperative Fishery Research Unit, Utah State University, Logan, Utah 84322, USA
2. South Dakota Cooperative Fish and Wildlife Research Unit, South Dakota State University, Brookings, South Dakota 57007, USA
3. Connecticut Department of Environmental Protection, Bureau of Fisheries, 165 Capitol Ave, Hartford, Connecticut 06106, USA
4. Oregon Department of Fish and Wildlife, Bend, Oregon 97702, USA