1. Oregon Department of Fish and Wildlife; Corvallis OR 97333 U.S.A.
2. Fish Ecology Division, Northwest Fisheries Science Center; National Marine Fisheries Service, National Oceanic and Atmospheric Administration; 2032 S.E. Marine Science Drive Newport OR 97365 U.S.A.
3. Washington Department of Fish and Wildlife; Olympia WA 98501 U.S.A.