1. Illinois Natural History Survey Illinois River Biological Station 704 North Schrader Avenue Havana Illinois 62644 USA
2. Center for Fisheries, Aquaculture, and Aquatic Sciences Southern Illinois University Carbondale Illinois 62901 USA
3. U.S. Geological Survey Upper Midwest Environmental Sciences Center 2630 Fanta Reed Road La Crosse Wisconsin 54603 USA
4. U.S. Fish and Wildlife Service Midwest Region Genoa National Fish Hatchery S5631 State Highway 35 Genoa Wisconsin 54632 USA