There are several reasons that goldfish and koi change color. Genetics, diet, pH, water temperature, mineral content of the water, and some things we probably aren't aware of. It isn't uncommon for goldfish to become completely white. It has been my experience that goldfish and koi colors are most vibrant in early spring while the water is still cool/cold. One variety of koi, the Kumonryu (Dragon Fish), will change from black with white markings to completely white depending on the season or water temperature. Some hobbyist feed their fish color enhancing food to help them maintain their bright colors. I believe this is an important factor if the fish is to be in a show.

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Last modified on Tuesday February 15, 2000