Goldfish
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The goldfish is a freshwater fish in the family Cyprinidae of the order Cypriniformes. It is commonly kept as a pet in indoor aquariums, and is one of the most popular aquarium fish. Goldfish released
Gold fish 1
Feral goldfish found in Essex County, Ontario.
Carassius auratus by Alexander Francis Lydon.
Goldfish from Fish Swimming Amid Falling Flowers, a Song dynasty painting by Liu Cai (c. 1080–1120)
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.
Goldfish
…than 31 scales along the lateral line, while crucian carp have 33 scales or more. Goldfish can hybridize with some other Carassius species of carp. Koi and common carp may also interbreed with goldfish to produce sterile hybrids. Wild goldfish typically grow to between 4.7 inches (12 cm) and 8.7 inches…
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.