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University of California
California Aquatic Invasive Species (AIS)
Invasive Clams, Mussels, Snails, etc.
Corbicula fluminea - Visit ITIS for full scientific classification.
- Prefer low flow areas with sandy substrates.
- Primarily found in freshwater.
- Can tolerate brackish (somewhat salty) water.
- Usually colonize near shore.
Invasion Pathways and Distribution
- Native to Asia, and parts of Africa and Australia.
- Now widespread throughout the U.S. and California.
- Possibly introduced in the U.S. as a food item used by Chinese immigrants, and/or unintentionally through the importation of the Giant Pacific oyster from Asia.
- Can continue to spread when used as live bait.
- Visit USGS for a current U.S. distribution map.
- Hermaphrodites, and can self-fertilize.
- Multiply and reach densities that clog water delivery systems.
- Filter water, removing plankton needed by native species, and changing water clarity. Microscopic young stages can be transported in water undetected.
- Can also alter habitat substrates, and outcompete natives for resources.
References and Useful Links
For references by category and links to other useful AIS sites see our LEARN MORE page.
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