Eurasian Watermilfoil was accidentally introduced to North America from Europe in the 1920s. It spread westward to inland lakes by boats and water birds. It reached Midwestern states between 1950 and 1980.
Curly-leaf pondweed was the most severe nuisance aquatic plant until the arrival of Eurasian Watemilfoil. It was accidentally introduced along with the carp. It forms surface mats that interfere with aquatic recreation.
Rusty Crayfish are native to streams in Ohio, Kentucky and Tennesse. Introduced by anglers who brought them north to use as bait, rusty crayfish have spread to many lakes and streams in Wisconsin, Minnesota and Ontario. They are prolific and can severely reduce aquatic vegetation, depriving native fish and their prey of cover and food. They also reduce populations of native crayfish and some species of fish.
For more information about this display contact Mandy Beall at 608-267-3531 or e-mail her at mandy.beall@dnr.state.wi.us
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This page was last updated on January 13, 2003.