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Goldfish change color for one of two reasons. The first is a lack of sunlight, which ends up retarding the pigmentation cells in the fish's scales that are responsible for color. This causes a fish to become lighter or white in color. The second reason is for a darkening in scale color. This is because due to irritation of the skin the fish's body releases a chemical called leukine which stimulates color pigmentation cells. Especially melanophores (black pigmentation cells) thus causing the fish to have abnormally high amount of black pigmentation.


depends...

they quite often colour with age, as they get older they get greyer (paler)

also a caused by poor health, feeding and water quality
It's all about where the tank is. For example, if you put a goldfish in its tank in a room with no light, it would turn white.

If your fish has changed colour, it's simply getting used to the light change from the shop/supplier to your home.

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7y ago

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