Wisconsin Department of Natural Resources

Zebra Mussels

Source: Wisconsin DNR Aquatic Invasive Species program

Date: Data continuously updated. Metadata last updated 5/09

This data represents waterbodies where infestations of zebra mussels are known to exist. These invasive mollusks may be growing in other waterbodies, but their presence has not been confirmed outside of the waters listed here. Zebra mussel monitoring is conducted on Wisconsin’s lakes and streams in the summer months, with the infestation data compiled in the fall.

Zebra mussels multiply rapidly and can clog water intake pipes and docks. They also reduce nutrients available for fish and other aquatic life to levels that are unhealthy for lake ecosystems. Zebra mussel larvae, called veligers, can be carried in boat ballast water to uninfested lakes. By state law, boaters must remove aquatic plants and zebra mussels from their boat before entering a lake, river or stream.

For more information, please visit the Invasive Species pages.