1. University of Washington, School of Aquatic and Fishery Sciences; 1122 N.E. Boat Street, Box 355020 Seattle WA 98195-5020 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.