At least 51 freshwater mussel species are known to exist in rivers, lakes and streams around Wisconsin. However pollutants such as phosphorous and polychlorinated biphenyls, or PCBs, have added to the decimation of freshwater mussel populations in areas like the Bay of Green Bay and the Lower Fox River. A roundtable including attendees from the DNR and the U.S. Fish and Wildlife Service, UW-Green Bay, The Nature Conservancy and the Oneida Nation of Wisconsin, among others, hope that research can help. WPR had the story.