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All the above, except largescale silver carp, have been cultivated in aquaculture in China for over 1,000 years. Largescale silver carp, a more southern species, is native to Vietnam and is cultivated there. Grass, silver, bighead, and black carp are known as the "Four Domesticated Fish" in China and are the most important freshwater fish species for food and traditional Chinese medicine. Bighead and silver carp are the most important fish, worldwide, in terms of total aquaculture production. Common carp, amur carp and crucian carp are also common food fishes in China and elsewhere. Goldfish, though, are cultivated mainly as pet fish. Common carp are native to both Eastern Europe and Western Asia, so they are sometimes called a "Eurasian" carp.