Japanese koi are carp. These fish are generally expensive, but range in mature size from 2 to 3 feet, come in many colors, and live for a very long time. Koi are best suited to ponds larger than 6 feet minimum diameter and at least 18 inches deep. A good rule of thumb is to add no more than 1 inch (length) of fish for every 3-5 gallons of water in the pond.
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Are there guidelines for the pond size acceptable for koi?
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