Important information from Pennsylvania Fish and Boat Commission:

Pennsylvania Fish and Boat Commission (PFBC) is reminding anglers and boaters to clean their gear after an aquatic invasive species (AIS), known as New Zealand Mudsnail (Potamopyrgus antipodarium), was found in the Little Lehigh Creek in Lehigh County.

New Zealand Mudsnails are very small, measuring less than one-quarter inch, with a relatively long, narrow, spiral shell that is generally brown to almost black in color. Like other aquatic invasive species, they disrupt ecosystems by rapidly multiplying and competing with native species for space and food.



New Zealand Mudsnail has spread to Europe, Asia, Australia and North America. They have been found in the Gunpowder River in Maryland and in the Musconetcong River in New Jersey (near Riegelsville), which is a tributary of the Delaware River.

Gear should be visually inspected and any clinging matter should be removed and disposed of in the trash. To kill Mudsnails, three methods are effective. Gear can be frozen for a minimum of eight hours or soaked in very hot water with detergent, maintained at 120 to 140 degrees Fahrenheit, for 10 minutes. The second method is not recommended for Gortex.

Mudsnails also can be killed by soaking gear for five minutes in a one-to-one solution of the commercial product, Formula 409 Cleaner Degreaser Disinfectant, and water. After soaking gear for five minutes, thoroughly rinse it with plain water. Simply spraying gear with the disinfectant or the mixture does not work. Also, general cleaners such as regular off-the-shelf Formula 409 have not been shown to be effective against Mudsnail.

If you suspect that you have found New Zealand Mudsnail (or any other AIS) in another waterway, please report your information at When reporting an AIS sighting it is very important to include as much information as possible, including close-up photos of the organism, the exact location (GPS coordinates work best), a description of what you found and your contact information.

For more information about New Zealand Mudsnail, please visit and scroll down to the Mudsnail link.