Preventing Introductions

You can help prevent unintentional introductions! Remember RIDNIS:

Replant with natives where possible when landscaping or building an ornamental pond. Do not assume something is native because you have seen it in your area. Contact your local nursery for information or visit the California Exotic Pest Plant Council website at for the 1999 Exotic Pest Plant List.

Inspect the sides and hull of your boat for attached plants or animals and remove them so you do not carry them to a new location. Place all organisms in a trash bin, not back into the water. Even small fragments of some plants can start new invasions.

Dispose of unused bait, seaweed, or other packing materials in a lined garbage can, not into the Bay, streams, lakes or other water bodies.

No dumping into the Bay! Do not release aquarium animals or plants into streams, lakes, bays or the ocean. Return them to a pet shop for resale or donate them to a school, nursing home or hospital, or if necessary, place them in your home freezer for 24 hours to humanely dispose of them, and then bag them for trash removal.

Instruct friends, family and others to keep the San Francisco Bay-Delta free of invaders!

Stop intentional releases, especially releasing live organisms to establish a new fishery or for "humane" reasons.

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*RIDNIS Project Disposal of Organisms Page, September 2003 - September 2005
(*Reducing the Introduction and Distribution of Aquatic Non-native Invasive Species through Outreach & Education)
University of California Cooperative Extension, Department of Environmental Science and Policy
Website maintained by Kelly Torres (
This project is funded by the CBDA California Bay-Delta Authority in cooperation with the University of California Cooperative Extension.