As a rapidly reproducing and quickly spreading filter-feeder its economic and ecological impacts on freshwater and estuarine systems have been diverse and complex. It colonizes slow-moving rivers, lakes, and the low-salinity regions (0-5 PSU) of estuaries. It is now found in the Great Lakes, on the Gulf and East Coasts, and in Mexico. fluminea was first introduced to the West Coast from Asia and then spread rapidly across the continent. Several hermaphroditic genetic lineages of these clams have been introduced to North America, Central America, South America, Europe and Hawaii. Corbicula spp., are native to Asia, including Indonesia and the Philippines and probably also to Africa and Australia. Corbicula fluminea, commonly known as the Asian Freshwater Clam, has a relatively thick and large shell, compared to other freshwater bivalves.
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