Asian carp is an informal grouping of several species of cyprinid freshwater fishes native to Eurasia, commonly referring to the four East Asian species silver carp, bighead carp, grass carp (a.k.a. white amur) and black carp (a.k.a. black amur),[note 1] which were introduced to North America during the 1970s and now regarded as invasive in the United States. These four species, now also known commercially as copi in the United States, are staple food fish in their native China, where they are collectively known as qing cao lian yong (青草鲢鳙) or si da jia yu (四大家鱼, "Four Great Domestic Fish")[note 2] and are farmed extensively.
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