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Zebra mussels arrived in the late 1980's in the ballast water of ships.
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Zebra mussels are infecting the water by injecting bacteria in it.
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The Nonindigenous Aquatic Nuisance Prevention and Control Act of 1990 prevents the introduction of, and to control the
spread of, unintentionally introduced aquatic nuisance species, including zebra mussels.