AIS Identification

The Alex Area Lakes are seeing more instances of AIS. By taking the right steps, you play an important role in keeping our lakes clean, safe and fun for generations to come!

What to Do When I Find AIS

If you suspect an AIS infestation:

  • Note the location
  • Take a photo or keep the specimen
  • Contact the AIS specialist in your region:

    Mark Ranweiler
    MN DNR Aquatic Invasive Species Specialist
    mark.ranweiler@state.mn.us
    218-739-7576, ext. 254


Types of AIS

  • Curly-Leaf Pondweed

    Curly-Leaf Pondweed

    • Leaves are stiff and crinkled like a crinkle-cut French fry.
    • Can grow to depths up to 15 feet.
    • Infestation begins with only a fragment.
    Learn more >
  • Asian Carp

    Asian Carp (Bighead and Silver)

    • Bighead and Silver Carp are two Asian carp species.
    • Bighead carp can weigh up to 110 pounds.
    • Silver carp are known to jump out of the water when disturbed.
    Learn more>
  • Spiny Waterflea

    Spiny Waterflea

    • Range in size from 1/4” to 5/8” in length.
    • Spread by attaching to fishing equipment.
    • Appear in abundance during late summer.
    Learn more>