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Koi maximum about 4 ft , some have been documented to be about 100 years old ( in Japan).But I have seen some older koi limited to about 2 ft ; so genetics must be a factor . Koi and goldfish are closely related. In my small pond ( roughly 800 gallons ) the biggest koi has been about 32". Their size is greatly limited by the size of the water body . So ...

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