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A zebra mussel is a small freshwater mollusc similar to a clam. They are native to several freshwater lakes in southeastern Russia. In recent centuries, they have spread through man-made canals to the Caspian Sea and many lakes and rivers throughout Europe. In the late 20th century, they spread to North America, first appearing in the Great Lakes in 1988. They probably crossed the Atlantic Ocean in ballast tanks of ships that had sailed from freshwater lakes in Europe to the Great Lakes.

Zebra mussels are considered an invasive pest in North America and in some European countries to which they have spread. They breed prolifically, such that even in their native environment, they live in very high densities. In environments to which they have recently migrated, they have a negative impact on the ecosystem by outcompeting native mussels and other filter-feeders. They are a nuisance to humans because huge numbers of them attach themselves to any available surface, including the insides of pipes used for power plants, canal locks, and municipal water supplies.

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12y ago
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7y ago

Dreissena polymorpha

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13y ago

yes

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Q: Is a zebra mussel an Exotic Species?
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