Skip to main content - The Official Portal for North Dakota State Government
New Zeland Mud Snail

New Zeland Mud Snail

Fact Sheet
Scientific Name (Potamopyrgus antipodarum)
Classification and Permitting Level 1 - Prohibited Aquatic Nuisance Species
Species Description A New Zealand mudsnail is a small (up to 1/8 inch in length) gray to brown snail with 7-8 fairly equal sections (whorls) separated by deep grooves.
Preferred Habitat They can typically be found near vegetation in shallow areas of lakes and streams.
Reason for ANS Designation It can reach high densities quickly and compete with native snail species for food and space. If found in high numbers, these snails may also foul water intake systems. Once established, there is no good control method.
Place of Origin This species is native to freshwater streams and lakes of New Zealand but were introduced to the United States in the 1980s. Initial introduction was likely from ships coming from Europe to the Great Lakes. Subsequent spread in the Western US was likely from contaminated water used in live gamefish shipments.
Stopping the Spread When taking equipment out of a lake or stream, remove all plants and mud and drain all water prior to leaving. Allow the equipment to dry completely, rinse with 120°F water for 5 minutes of contact, or disinfect using an approved method such as a .8% quaternary ammonia solution for 10 minutes of contact time or freezing for 72 hours.
Additional Information USGS Fact Sheet