Education
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Freshwater mussels of the Mississippi River
Currently there are 39 species of mussels (commonly called clams) found along the Wisconsin portion of the Mississippi River. Their distribution varies between localized and rare populations to those that are more widely found such as the giant…
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Mississippi River fish
The Upper Mississippi River is home to over 119 species of fish -- more species than are found in any of Wisconsin’s inland lakes. Favorite sport fish include walleye, sauger, largemouth bass, smallmouth bass, channel catfish, northern pike,…
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Mississippi River - Frequently asked questions
Hunting Where is it legal to hunt with a Wisconsin license? You may hunt with a Wisconsin hunting license only in open hunting areas within Wisconsin. The commercial navigation channel, marked with large red or black buoys, is the state line in…
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Understanding invasive species
Wisconsin Statute Section 23.22 (1) (c) defines invasive species as "nonindigenous species whose introduction causes or is likely to cause economic or environmental harm or harm to human health." Humans move organisms around all the time.…
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Invasive Species Rule – NR 40 terminology
Prohibited Invasive species that are not currently found in Wisconsin, with the exception of small pioneer stands of terrestrial plants and aquatic species that are isolated to a specific watershed in the state or the Great Lakes, but which,…
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Report invasive species
We are working to keep invasive species out of Wisconsin. Early reports of new populations allow us to respond rapidly and control invasives before they spread into new areas. Select from the tabs below to report invasive species you have found.…
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Publications
Publication Catalogs Terrestrial invasive plant publications catalog Aquatic invasive species publications catalog Management Plans Wisconsin Aquatic Invasive Species Management Plan Invasive Plant Control and Restoration Resources
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Partners
Please choose a category from the menu below for a listing of related organizations. Please note all links exit the DNR website. Links to publications and other educational resources can be found on our publications page.
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Purple loosestrife biocontrol — and you
Purple loosestrife (Lythrum salicaria) is a flowering plant that can reach 3’-7’ tall and is listed as a Restricted Invasive Species in Wisconsin because of its history of causing negative ecological impacts to wetlands and shorelines. Extensive…