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Round gobies and Michigan Lakes

Another recent invader causing considerable concern is the a small bottom-dwelling fish with a large head resembling that of a tadpole. First discovered in Lake St. Clair in 1990, presumably introduced via ballast water from transoceanic vessels, the round goby and...

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The Eurasian Ruffe

The Eurasian ruffe (Gymnocephalus cernuus) warrants particular attention because of its  great potential for adversely affecting the multibillion-dollar Great Lakes sport fishery.  The ruffe is a small but aggressive fish native to Eurasia. It was introduced into Lake...

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Zebra mussels first appeared in Lake St. Clair

Zebra mussels first appeared in Lake St. Clair (yellow star, north of Lake Erie), possibly from ship’s ballast water from the Black Sea region. They rapidly spread downstream with the current, and upstream and to other watersheds on boats, with bait, and by other...

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