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We have mussels ... The Huron River Valley is home to over 445,000 people ; several threatened and endangered species of fish , mussels , amphibians , and mammals ; and a number of bogs , wet meadows , and remnant prairies of statewide significance . The mussels reproduce rapidly in suitable habitats and have created serious environmental and economic problems in many parts of the country . " Boaters and anglers are reminded that they are a common mechanism by which nuisance exotic species such as Eurasian water milfoil , zebra mussels and numerous undesirable fish species are spread in New York . Such large concentrations of mussels restrict water flow , reducing intake .