1. Coastal Oregon Marine Experiment Station, Hatfield Marine Science Center, Department of Fisheries and Wildlife, Oregon State University, Newport, OR 97365
2. Oregon Department of Fish and Wildlife, Marine Resources Program, Newport, OR 97365
3. Fisheries and Oceans Canada, Pacific Biological Station, Nanaimo, British Columbia V9T 6N7, Canada
4. NOAA Fisheries, Point Adams Research Station, Hammond, OR 97121