Asian clam, Corbicula fluminea, is small, bivalve mollusk native to eastern and southern Asia and was likely introduced to the West Coast of North America around 1930. Also known as Asiatic clam, Prosperity clam, Pygmy Clam, Golden clam, or Good luck clam,Corbicula fluminea can be found in the sediments of freshwater habitats. The outside of the shells are yellow-green to brown with elevated, thick concentric rings. If the color chips away, white spots can be seen underneath. The inside of the shells may be light purple. Adults are small, usually less than 1 1/2″ in length.
Confirmed observations of Asian clam submitted to the NYS Invasive Species Database. For more information, visit iMapInvasives
This species is found in freshwater throughout the U.S. It is hardy and persistent and can withstand many aquatic habitats, often preferring the warmer, shallower areas near the shore.
Threats & Impacts:
Asian clam displaces highly vulnerable native mollusks that are often already threatened, reduces biodiversity, alters the food chain, may cause algae blooms, damages equipment, and clogs industrial and commercial water systems. They are fast growing and can spread quickly. Able to self-fertilize, one clam can release roughly 350 offspring daily if conditions permit.
In closed environments such as power plants, chemical and mechanical methods can be used. Management is very difficult and labor intensive in a natural aquatic system, and eradication is very unlikely. Stopping aquarium dumping and live food releases, and cleaning boats and bait buckets are critical to preventing its spread.