Asian Clam

Asian Clam

  Fact Sheet
Scientific Name (Corbicula fluminea)
Classification and Permitting Level 1 - Prohibited Aquatic Nuisance Species
Species Description An Asian clam is an invasive freshwater clam that is less than 2 inches in length. The size and distinctive coarse rings on the shell distinguish this species from native clams.
Preferred Habitat Live Asian clams are typically buried in up to 6 inches of sand or gravel, though shells can often be found on the sediment surface.
Reason for ANS Designation Although there may be some impact by this clam through its filter-feeding of small plants and animals, the most significant impacts come from fouling water pipes in power and water industries. Once established, there is no good control method.
Place of origin Asian clams are native to southern Asia but were introduced to the United States in the 1930s. It was likely originally imported as a food item or as a contaminant in oyster shipments. More recent introductions and spread are likely from the movement of water or vegetation carrying juvenile clams.
Stopping the Spread When taking equipment out of a lake or stream, remove all plants and mud and drain all water prior to leaving. Allow the equipment to dry completely, rinse with 140°F water for 10 seconds of contact, or disinfect using an approved method such as a .02% bleach solution for 10 minutes of contact time or freezing for 72 hours.
Additional Information USGS Fact Sheet