Information for boaters
Undaria attaches to boat hulls, ropes, chains, floats and other boating and marina equipment. It can be accidentally spread if a boat it is attached to travels to another location. While Undaria is capable of spreading short distances on its own (see Life Cycle), accidental spread via boats can speed up the rate of spread and result in new areas being infested.
Boaters can help prevent the spread of Undaria and other marine non-native species in a number of ways.
- Clean before you go. Clean your boat before you leave your home port for another location, especially if you plan to stay away overnight or longer. If you have berthed away from home for more than a few days, it is wise to clean again before departing for the next location.
- Remove large, reproductively mature individuals (see identification) attached to your boat, as these represent the greatest risk for seeding new locations. Fortunately, these can be easily seen by divers and removed by hand or with a scraper during an in-water cleaning. If you suspect you have found Undaria, please do not dispose of it in the water. Please contact us with suspected sightings by signing up and following instructions to upload a photo (Sign Up Link).
- Apply antifouling paint to your boat on a regular basis and make sure that the type you use is appropriate for your boat. Some paint types depend on regular sailing in order to work properly.
- Support Undaria management efforts in your area. Volunteers need to help remove Undaria in San Francisco Bay and Half Moon Bay, California.
- Help spread the word about Undaria and other marine invasive species and report suspected sightings to us.
- The microscopic stage is the most difficult to manage, but cleaning boats with freshwater at high pressure may help to get rid of it. Rinsing gear in freshwater and allowing it to dry thoroughly between uses will also help.