Carp
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The term carp is a generic common name for numerous species of freshwater fish from the family Cyprinidae, a very large clade of ray-finned fish mostly native to Eurasia. While carp are prized quarrie
1913 illustration of Cyprinus carpio, better known as the common carp
Common carp in Lake Minnetonka, Minnesota
Cyprinus carpio skeleton
Cyprinus rubrofuscus (Amur carp) have been domesticated and bred in Japan since the early 19th century for ornamental purposes in their koi form.
Koi
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Koi, or more specifically nishikigoi, are colored varieties of carp that are kept for decorative purposes in outdoor koi ponds or water gardens.
Carp
…important food fish to humans. Several species such as the various goldfish (Carassius auratus) breeds and the domesticated common carp variety known as koi (Cyprinus rubrofuscus var. "koi") have been popular ornamental fishes. As a result, carp have been introduced to various locations, though with mixed…
Koi in Japan
A school of koi containing multiple different varieties
Terraced rice paddies in Yamakoshi, Niigata Prefecture
Illustration of a three-colored carp in Ritsurin Garden, 1900. This is the oldest illustration of koi. It has the annotations asagi on its back and red on its belly.