Koi fish is a species of carp fish with a unique color and pattern. They are originated from Eastern Asia. The name “Koi” is a Japanese word which means carp fish. Mostly, they are kept by humans in an outdoor ponds to beautify the garden.
Their body formed a curve in the middle which make it looks chubby, and it is similar to the other species of carp fish. They have three pairs of fin located on the bottom of their body and a long fin on top of their body. Their tail is flat and it is spread vertically. Their eyes are located on each side of the head. Their mouth is wide with thick lips around it. They can form an o-shape when they open their mouth.
Their skin are covered with large and colorful scales. Some of them have more than two color on their body such as white scales with black and orange spots or white scales with black and red spots. They can grow up to the size of 80 cm with the maximum weight of 14 kg. It is recorded that they can live up to 20 years.
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