New Zealand Mud Snail
- Average of 1/8 inch long
- 5‐6 whorls on shell
- Shells vary from light brown to black
- Difficult to identify
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.