Aquatic Invasive Species

Pelican River Watershed District has long been involved in education, research and management activities relating to aquatic invasive species. We encourage you, whether a resident, angler, watersports enthusiast, student or visitor to be informed and diligent in keeping our lakes clean and preventing the further spread of AIS.

Know the laws:

21 days - When moving equipment from a lake or river, all visible zebra mussels, facet snails and aquatic plants must be removed whether dead or alive.  Equipment must be dry for at least 21 days and AIS free before placing in another waterbody.

Pull the Plug - All water draining devices must be removed or set to "open" when on public roads - including live-wells.

Bait Disposal - Dispose of all unwanted bait in the trash, dumping unused bait on land or in the water is not legal.

Answers to Common AIS questions

  • AIS can be stopped; waterfowl do not spread zebra or quagga mussels.
    • The spread of AIS follows the highways not flyways.  There is no evidence or reliable research to support the idea that water in the bill of a pelican or cormorant spreads AIS.  There are no known infestations discovered that are attributed to this vector.
  • Inspections lower the risk of AIS transfer.
    • Everyone is responsible to protect our water resources.  Inconvenience does not trump being a responsible boater.
  • Introducing a new invasive to a water way only compounds issues.
    • There are many other aquatic invasive species that are on their way to Minnesota that can be more devastating than zebra mussels.  Quagga mussels can out-compete zebra mussels for food and live in much deeper depths of water.  Hydrilla is like milfoil on steroids.  In addition, the impact of individual AIS becomes more complex with each invasive in a water body.  Once a water body has one invasive, it becomes more important to keep any other AIS out.
  • Inspections are necessary between launches, even in non-infested waters.
    • It is impossible to know which lakes may already be infested, therefore it is necessary to assume all water bodies may be infested.  It may take 2-3 years after an infestation to discover a colony of mussels.
  • Decontamination is worth the time.


New Aquatic Invasive Plant found in MN

The Minnesota Department of Natural Resources reported that a new plant, actually an algae, has been found in two connected lakes, Koronis and Mud, near Paynesville. Like Eurasian milfoil, it grows into dense mats that can cover the surface of shallow waters, squeezing out other plants and creating a wall between fish and their spawning grounds.

Click here for the entire article

DNR Aquatic Vegetation Survey of Detroit Lake

In 2007 the Minnesota DNR conducted a survey of Detroit Lake to assess the extent of invasive plant spread throughout the lake. The DNR was interested in monitoring flowering rush in Detroit Lake because at the time, only 14 water bodies in the state were recognized as containing flowering rush (MNDNR Ecological Resources 2006).

DNR Ecological Resources invasive species field staff conducted a point-intercept vegetation survey of Detroit Lake in late July, 2007. Submerged aquatic plants were found in 97 % of the sites surveyed from the shore to a depth of 20 feet. A total of 25 native aquatic plant species were recorded. Common native aquatic species included greater bladderwort (Utricularia vulgaris), muskgrass (Chara spp.), northern water milfoil (Myriophyllum sibiricum), and sago pondweed (Stuckenia pectinata).



To view full report click here

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PRWD in the News

PRWD/MN DNR Zebra Mussel impact study

MPR News Story on PRWD Flowering Rush Project

Dan Gunderson, MPR News, visited Lake Sallie with Brent Alcott to discuss the success of the…

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Recent Water Levels
Detroit 1333.9 ft
Last Updated: 10/10/2018
Floyd(s) 1354.6 ft
Last Updated: 10/10/2018

Melissa 1328.2 ft
Last Updated: 10/10/2018
Sallie 1330.2 ft
Last Updated: 9/28/2018

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