1. Department of Renewable Resources, University of Alberta, 751 General Services Building, Edmonton, AB T6G 2H1, Canada
2. University of Wisconsin, 1975 Willow Drive, Madison, WI 53707, USA
3. Bureau of Fisheries Management, WI Department of Natural Resources, GEFII, 101 S. Webster Street, Madison, WI WI53703, USA
4. University of Saskatchewan, 44 Campus Drive, Saskatoon, SK S7N 5B3, Canada
5. Fisheries and Oceans Canada, 867 Lakeshore Road, Burlington, ON L7S 1A1, Canada