Protect WSL
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Do you have a landing/launch on your property?
Clean Boats, Clean Waters
It’s the LAW.
Wisconsin has various laws in place to prevent the introduction and control of the spread of aquatic invasive species and diseases in Wisconsin.
Wisconsin’s invasive species rule, Wis. Admin. Code NR 40 [PDF exit DNR]
Swimmer’s Itch Research from Northland College and a Link to Preventing Swimmer’s Itch from Ronald Reimink
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OPEN MEDICINE INSTITUTE & HOWARD YOUNG FOUNDATION’S
Tick Borne Illness Center of Excellence
Read about Eurasian Watermilfoil in Wisconsin
Eurasian watermilfoil can reproduce via fragmentation, meaning a single stem fragment introduced to a waterbody could take root and establish a new population. While Eurasian watermilfoil can grow to nuisance levels in some waterbodies, recent studies have found that most Wisconsin lakes currently have populations at low frequencies, with relatively few lakes exhibiting very dense growth.
https://www.invasivespeciesinfo.gov/aquatic/plants/eurasian-watermilfoil
Wisconsin Aquatic Invasive Species Management Plan
Oak Wilt Information Updated
By Kyoko Scanlon, DNR Forest Pathologist, Fitchburg
In 2025, oak wilt was detected for the first time in Hughes Township, Bayfield County, a northern Wisconsin location where oak wilt remains uncommon. There were no new county finds in 2025.
Based on the findings in 2025, the maps in the Oak Harvesting Guidelines To Reduce The Risk Of Introduction And Spread Of Oak Wilt (the oak wilt guidelines), oak wilt fact sheet and were updated. The maps in the oak wilt guidelines are good through the end of 2026.
Purple Loosestrife on our shores!
INVASIVE Wetland perennial, three to seven feet tall, with up to 50 stems topped with purple flower spikes. One prominent leader stems, but many side branches often make the plant look bushy. Clipped plants grow back and cut stems readily re-root in the soil to produce new plants. Many areas of the state use safe biocontrol beetles that feed on the loosestrife to keep it in check and allow other plants to grow.
PURPLE LOOSESTRIFE BIOCONTROL — AND YOU
Photo below: Young Loosestrife plants
LDF Fisheries
Hunter Mayo, Fish Hatchery Manager
Phone: 715-588-4492
Email: hmayo@ldftribe.com
Address: 1000 Old Abe Road
Lac du Flambeau, WI 54538
Fisheries and Fish Culture program raises all fish necessary for stocking reservation waters. Since 1960, 577,511,012 walleye fry, 2,979,316 walleye fingerlings, 2,289,714 muskellunge fry, and 125,176 muskellunge fingerings have been raised. Fish population studies involving electro fishing, creel surveys, etc. are conducted regularly under this program.