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Zebra mussel

The Zebra mussel (Dreissena polymorpha) is a bivalve mussel native to freshwater lakes of southeast Russia.

Zebra mussels are currently causing serious problems in North America and Sweden, where they are considered an invasive species.

Zebra mussels are voracious filter-feeding organisms.

They remove particles from the water column, increasing water clarity.

Note:   The above text is excerpted from the Wikipedia article "Zebra mussel", which has been released under the GNU Free Documentation License.
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