zebra mussels on bottom of a pier

algae anchoring animal aquatic autumn beach biege bivalves boating bottom byssal chemicals clog county crustacean dispersal dreissena ecosystem eliminate feeders feeding filter fishing freshwater geneva great invasive kill lake lakes life macrophytes marine michigan mollusk mussel mussels organism organisms out outdoors outside over pest pesticide pests pier pipes polymorpha pulled rapidly recreational sand shaped sharp siphon species spread striped stripes tan that the umbo walworth was wisconsin zag zebra zig