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Unless the period of rest is extended well beyond a normal seasonal variation in temperate zones, the koi will reach full size. Indeed, many advocate a period of cool water and rest to best replicate the natural environment in which carp and koi evolved. Although the Japanese have learned to heat the water in winter to avoid extremes, the water in the greenhouse ponds is cool and feeding is minimal or entirely withheld for the koi over 2 years old.
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