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Study says grass carp have invadedn Great Lakes; including Lake Ontario

nvasive grass carp have reached three of the Great Lakes and pose a significant environmental risk there, but time remains to prevent them from getting out of hand, according to a scientific analysis released Friday.

The voracious grass carp is among four Asian carp species threatening to reach the world’s largest surface freshwater system. Bighead and silver carp, the most feared, would compete with native fish that eat microscopic plants and animals, while grass carp feast on aquatic vegetation that provides crucial habitat and spawning grounds.

Grass carp have been found in Lakes Erie, Michigan and Ontario, although it’s uncertain how many there are or how widely they have spread, U.S. and Canadian researchers said. At least some are reproducing.

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