In Wisconsin, call Sea Grant specialist Phil Moy at (920) 683-4697, or use the online form to report a zebra mussel sighting. Outside of Wisconsin, please contact your nearest Sea Grant program, or your state department of natural resources

How to identify a zebra mussel:

• Zebra mussels look like small clams, with a yellow or brownish D-shaped shell, often with dark and light-colored stripes.
  
  
• They can be up to two inches long, but most are under an inch.
  
  
• They usually grow in clusters, and are generally found in shallow (6-30 feet) water.
  
  
• Zebra mussels are the only freshwater mollusk that can attach itself firmly to solid objects - submerged rocks, dock pilings, boat hulls, water intake pipes, etc.

What to do if you spot an invader:

• Write down the date and exact location where the zebra mussel was found.
  
  
• If possible, take the mussel with you and store it in rubbing alcohol.
  
  
• In Wisconsin, report your sighting on this web site, OR
  
  
• Call Phil Moy at Wisconsin Sea Grant (920) 683-4697.
  
  
• Outside of Wisconsin, contact your nearest Sea Grant program, or your state department of natural resources.
  
  
• Whatever you do, DON'T throw it back into the water!

What else can I do?

• Carry a Zebra Mussel Watch card! That way, you'll know what they
  look like and will be able to report any sighting to the appropriate
  authorities. Order your free card online.
  
  
• Check out and print the Zebra Mussel Field Guide for more zebra mussel photos.
  
  
• Visit the UW Sea Grant Nonindigenous Species Web site for information on how to get a Stop Aquatic Hitchhikers sticker.