New Zealand Mud Snail

New Zealand Mud Snail

(Potamopyrgus antipodarum)
*Detected in Michigan*

Report this species to:

Lucas Nathan, DNR 517-599-9323 or Bill Keiper, EGLE

If possible, please take one or more photos of the invasive species you are reporting. Also make note of the location, date and time of the observation. This will aid in verification of your report. You may be asked to provide your name and contact information if follow-up is needed.

- Or - use the Midwest Invasive Species Information Network (MISIN) online reporting tool 

- Or - download the MISIN smartphone app and report from your phone -



  • Average of 1/8 inch long
  • 5‐6 whorls on shell
  • Shells vary from light brown to black
  • Difficult to identify

Michigan EGLE

new Zealand mud snail
University of Colorado, Natural History Museum

Habitat: New Zealand mud snails can tolerate a wide variety of habitats, including reservoirs, estuaries, rivers, and lakes. They are most prolific in water bodies with a constant temperature and flow, but are highly adaptable.

Diet: Diet consists of diatoms, detritus, and plant and animal matter attached to submerged debris.

Native Range: New Zealand

Local Concern: While mudsnails are able to reproduce sexually, it is not always necessary. Populations in the U.S. are made up almost entirely of self‐cloning parthenogenetic females. In a matter of one year, a single female could result in a colony of 40 million snails. They hold no nutritional value for native fishes, so populations in the U.S. do not fall subject to predation.

U.S. Distribution: Western United States, Great Lakes, and the Chesapeake Bay

Means of Introduction: Possibly via ballast water of transoceanic vessels or game fish imports

Status and Strategy for New Zealand Mudsnail Management This document provides in-depth information about New Zealand Mudsnail in the State of Michigan including identification, distribution, management, and control options.

Information Sheet about New Zealand Mudsnail (printable PDF)