Our Current Identified Threats Include:
- Eurasion watermilfoil
- Curly-leaf pondweed
- Bur oak blight
Aquatic Invasive Species
Top Concerns: Zebra Mussels & Eurasian Watermilfoil
Spreading to the Iowa Great Lakes from nearby Clear Lake, zebra mussels are an ongoing concern for lakes area residents and tourists. Boaters from Lake Delhi and the Mississippi River traveling to the Okoboji area also must be careful not to spread this species.
Eurasian watermilfoil threatens the lakes area due to its presence in lakes near the Twin Cities. Boaters visiting the area from this area are asked to keep boats, motors, trailers, live wells, and other equipment out of the water for five to 10 days and wash them with hot water before entering our lakes.
Potential Concerns: Asian Carp (Flying Fish)
The Silver Asian Carp, one of several Asian carp species, must be kept out of the Iowa Great Lakes, as they are a concern and potential danger to boaters. These fish have been known to jump several feet out of the water as they are startled by passing watercraft.
To keep Silver Asian Carp out of the lakes, IGLA has helped with establishing an electric fish barrier at the Lower Gar Outlet to prevent these fish from entering the lakes during periods of flooding and high water.
In the past, the Iowa Department of Natural Resources has stationed officers at boat ramps to educate boaters and prevent the spread of aquatic invasive species.
IGLA also has a volunteer program to assist the DNR on busy weekends. Volunteers inspect boats and interview boaters to protect our lakes.
What to do if you find aquatic invasive species