Why Are We Concerned About Zebra Mussels and Eurasion Watermilfoil?
The zebra mussel (Dreissenia polymorpha) is an exotic mollusk that is threatening the environmental health of freshwater lakes and rivers in the United States. Adult zebra mussels are characterized by a semi-D shaped, bivalved shell with light and dark brown or black banding (stripes) and are no larger than 5 cm (2 inches).