Information for aquaculturists
In The Netherlands Undaria has become a major pest of mussel growers (see Impacts page). While Undaria is capable of spreading short distances on its own (see Life Cycle page), accidental spread via aquaculture gear and species can speed up the rate of spread and result in new areas being infested.
Undaria can attach to nearly any material left in saltwater, including aquaculture species. Accidental spread via aquaculture equipment is thought to be the route by which Undaria has spread in some locations. You can help prevent the spread of Undaria and other marine pests in a number of ways.
- Clean all equipment and gear before moving it to a new location. Cleaning with a high-pressure hot water sprayer is probably the best way to remove and kill attached organisms, including small, hard-to-see life stages. High-pressure washing with cold water will also be effective in removing many fouling organisms, and allowing equipment to thoroughly dry before transfer to another location will help ensure that these organisms do not survive. Undaria cannot reproduce from fragments, but other nuisance species can, so whenever possible, cleaning should be done on land and run-off into the ocean should be prevented.
- Carefully remove large, reproductively mature individuals (see Identification page) attached to your equipment, as these represent the greatest risk for seeding new locations. 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).
- Avoid moving aquaculture species from one water body to another as these may also be fouled with nuisance species.
- 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.