Corbicula fluminea is a species of freshwater clam, an aquatic bivalve mollusk in the family Cyrenidae. This species is often confused with Corbicula fluminalis due to the two species' similar colour and texture. The species is regarded as having originated somewhere in Eastern Asia, leading to the common names of Asian clam or Asiatic clam. In the aquarium and koi pond trade, it is often called golden clam or golden freshwater clam. In Southeast Asia, it is known as the prosperity clam or good luck clam. In Korean, the name is 재첩 , and the species is used for a common dish called jaecheop-guk . The species has been introduced into many parts of the world, including South America, North America and Europe. Right after reaching maturity, these clams produce eggs, followed by sperm. Even later, they produce eggs and sperm simultaneously. They can self-fertilize, and release up to 2,000 juveniles per day, and more than 100,000 in a lifetime. Juveniles are only 1 mm long when discharged, and take one to four years to reach maturity. At this time, they are about 1 cm long. Adults can reach a length of about 5 cm. The outside of the shell is normally yellow-green with concentric rings. The color can flake, leaving white spots. The shells are lightly purple on the inside. They feed primarily on phytoplankton , which they filter from the sandy or muddy bottoms of streams, lakes, or canals. According to the United States Geological Survey, C. fluminea is likely to continue to expand its North American range until it reaches its lower temperature tolerance.The primary economic and social impact of the invasion of C. fluminea has been billions of dollars in costs associated with clogged water intake pipes of power plants, among others. Ecologically, C. fluminea contributes to declines and replacement of highly vulnerable, already threatened native clams. .
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