New York Metropolitan Region and New Jersey
Freshwater Mussel Identification Handbook


    


    
Dreissena polymorpha

Distribution: widely throughout North 
America from eastern Canada and New
England to Minnesota, Georgia and 
Oklahoma; locally in the Hudson River

Conservation status: common to 
abundant throughout

Conservation challenges: "zebra mussels"
pose a significant threat to native freshwater 
mussels, and appear to have caused
significant declines in abundance and
distribution for several metro area species