I have a black poppy eyed fish that has suddenly turned gold in the body only. Any ideas what is wrong?

Answers:
Most golfish will change color as they mature. Add some salt for freshwater aquariums to be on the safe side.
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some of them change colors as they age. go to goldfish.com

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just aging

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Nothing is wrong, the fish is just getting older. They don't stay black.

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most goldfish go through a color changing phase at 6 months of age. (body size about 1.5-2 inches in diameter) They can go through as many as 7 color changing phases but most will change just once or twice. Because almost all goldfish are born dark brown one color changing phase is common. I wouldn't worry about it unless it is an external growth outside the body.

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black is not a very stable color in goldfish, they usually change colors, nothing is wrong with your fish

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Thats normal. I had golfish that turned white and its fine.

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It's just aging.or either it had a decended with that wasn't black