1. Illinois Natural History Survey, Illinois River Biological Station, Havana, IL, USA
2. U.S. Geological Survey, Upper Midwest Environmental Sciences Center, WI, USA
3. U.S. Fish and Wildlife Service, La Crosse Fish and Wildlife Conservation Office, WI, USA
4. Department of Natural Resources, Cornell University, Ithaca, NY, USA in cooperation with the Division of Marine Resources, New York State Department of Environmental Conservation, New Paltz, NY, USA;
5. Division of Inland Fisheries Management, North Carolina Wildlife Resources Commission, Greenville, NC, USA