Zebra mussel shells cover a beach at the mouth of Silver Creek in Manitowoc, Wisconsin.
A Zebra Mussel Field Guide to Zebra Mussel Watch home University of Wisconsin Sea Grant
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 A Zebra Mussel Field Guide
 Yellow or brownish D-shaped shell, often with dark and light-colored stripes * Up to two inches long, but most are under an inch * Usually grow in clusters, and are generally found in shallow water * The only freshwater mollusk that can attach itself firmly to solid objects