1. Department of Fisheries, Wildlife, and Conservation Biology University of Minnesota St. Paul Minnesota 55108 USA
2. Wisconsin Department of Natural Resources, Bureau of Fisheries Management 8770 Highway J Woodruff Wisconsin 54568 USA
3. Minnesota Department of Natural Resources Fisheries Research Unit 50317 Fish Hatchery Road Waterville Minnesota 56096 USA
4. U.S. Geological Survey Wisconsin Cooperative Fishery Research Unit College of Natural Resources University of Wisconsin–Stevens Point 800 Reserve Street Stevens Point Wisconsin 54481 USA