Habitat Conservation

Invasive Species Program

New Zealand Mudsnail

New Zealand Mudsnail INFO

• Map of CA Infested Areas:
  Go to “Custom Maps” near the bottom of the page.  Click on California in the left-hand column to see a dot map of occurrences. Click on each dot to get information about individual sites.  Click on California in the right-hand column to see the hydrologic unit that each occurrence is located in.  These maps may take a minute or two to load.  Any new information entered into the database is incorporated into the maps when you select them.
• New Zealand Mudsnails in the Western U.S.: www.esg.montana.edu/aim/mollusca/nzms
• Frequently Asked Questions

• Global Invasive Species Database: New Zealand Mudsnail

• General Invasive Species Info

What you can do to prevent the spread of New Zealand Mudsnails

• If you wade, freeze waders and other gear overnight (at least 6 hours).
• Have extra waders and boots that are used only in infested waters. Store them separately.
• After leaving the water, inspect waders, boots, float tubes, boats/trailers—any gear used in the water.
• Remove visible snails with a stiff brush and follow with rinsing.
  If possible, freeze or completely dry out any wet gear.
• Never transport live fish or other aquatic animals or plants from one water to another.
• Snails range in size from a grain of sand to 1/8 inch in length and are black or brown in color.
• GET THE WORD OUT !

News Releases

• DFG Seeks Assistance in Slowing Spread of New Zealand Mud Snails (January 7, 2008)
• New Zealand Mud Snails Found At Hot Creek Hatchery (February 14, 2007)
• Putah Creek to Re-open to Fishing April 24 (April 16, 2004)
• DFG Offers Suggestions to Prevent Spread of New Zealand Mud Snails (January 13, 2004)
• Discovery of Invasive New Zealand Mud Snail Forces Temporary Closure of Putah Creek (December 16, 2003)

Documents

• National Management and Control Plan for the New Zealand Mudsnail (PDF)
• How to Prevent the Spread of New Zealand Mudsnails through Field Gear (PDF)
• New Zealand Mudsnail Watch Card (PDF)
• Controling the Spread of NZMS on Waders (Admin Report 2005-2) (PDF)
• Printable Mudsnail 12" x 18" color poster (PDF)
• Printable Mudsnail 11" x 17" black and white poster (PDF)