How Big Do Koi Carp Grow?


Quick Answer

Koi carp grow to an average size of 24 to 36 inches long. It is possible for some to reach lengths greater than 4 feet but only when pond conditions replicate their natural environment and they have plenty of space.

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How Big Do Koi Carp Grow?
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Full Answer

Native to China and Japan, koi carp should be kept in ponds a minimum of 4 feet deep, and there must be at least 10 gallons of water for every fish. Since the species produces a lot of waste, a filtration system is a must, and at least 10 percent of the water should be changed out each month to control the amount of ammonia, nitrates and other toxins in the water.

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