1. Great Lakes Fishery Commission, Ann Arbor, Michigan, USA;
2. Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada;
3. U.S. Geological Survey, S.O. Conte Anadromous Fish Research Center, Turners Falls, Massachusetts, USA;
4. Department of Fisheries and Oceans Canada, Sea Lamprey Control Centre, Sault Ste. Marie, Ontario, Canada;
5. U.S. Fish and Wildlife Service, Marquette Biological Station, Marquette, Michigan, USA