SD Least Wanted.comAquatic invasive Species

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new zealand mudsnail


New Zealand


New Zealand Mud Snails grow to about 5mm in length and have brown or black cone-shaped shells that twirl to a point.


These snails can reproduce quickly and reach extremely high densities. They alter the foodweb by consuming algae and plankton.

Range Expansion:

New Zealand mudsnails can be spread by all water users. They often attach to felt soled waders and fly fishing equipment.

South Dakota Distribution:

New Zealand mudsnails have not been found in South Dakota.


Keep Aquatic Invasive Species Out of South Dakota's Waters


  • Remove aquatic plants and animals before leaving any waterbody.
  • Drain water from bait bucket, live well, bilge and motor before leaving any waterbody.
  • Dispose of unwanted bait, fish parts, and worms in the trash.
  • Spray/wash boat, trailer, and equipment with high pressure hot water on your way home or at home -OR- dry everything for at least 5 days.
  • Always report questionable species.


  • Never release live animals or plants - this includes all aquarium species, bait, pets or water garden plants. Do not release these into the wild. If you cannot find another home for animals, dispose of them in a trash can or bury them. Seal plants in plastic bags and dispose.


Because these hitchhikers can:

  • Reduce game fish populations
  • Ruin boat engines and jam steering equipment
  • Make lakes/rivers unusable by boaters and swimmers
  • Dramatically increase the operating costs of drinking water plants, power plants, dam maintenance, and industrial processes
  • Reduce native species
  • Degrade ecosystems
  • Affect human health
  • Reduce property values
  • Affect local economies of water-dependent communities.
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