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Corbula amurensis
Image courtesy of U.S. Geological Survey
Corbula amurensis
Taxonomic Group: Mollusks-Bivalves


Corbula amurensis is commonly known as the Asian Brackish-water Clam, the Overbite Clam, and the Brackish-water Corbula. It is native to estuarine habitats from Russia to southern China. Outside of its native range, it is only known from San Francisco Bay, California. It was first collected from the inner brackish regions of the estuary in 1986 and rapidly increased its biomass. It occurs in sand, mud, and clay substrates, usually in shallow subtidal environments, but can also be abundant in intertidal mudflats. It has been listed by the Invasive Species Specialist Group of the World Conservation Union (IUCN) as one of the '100 worst invasive species’. Its economic and ecological impacts are mixed. Declines in many recreationally important fish stocks, as well as native endangered species, have been attributed, in part, to the food-web changes caused by the C. amurensis invasion, although these effects are difficult to separate from the many other human impacts on the inner Bay-Delta system.

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Fofonoff PW, Ruiz GM, Steves B, Simkanin C, & Carlton JT (2018)
National Exotic Marine and Estuarine Species Information System.
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Marine Invasions Lab
Smithsonian Environmental Research Center

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