Black Moore discolouration?

My Black Moore's (pardon me) anal area is changing from black to gold. He's behave and eating fine, though. What's going on?

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Goldfish can and generally will change shades and color quite recurrently, from black to gold, and white to gold, sometimes even reverse but not very repeatedly.

It's normal unless he's turning very pale, next he's probably sick.

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i just took my black moore out of my pond for the whinter and hes completely orange and he was completely black when i put him contained by, they say if you keep a black moore contained by completedarkness it will turn completely white. color change is normal dont worry roughly speaking it

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Answers:    mine did the same thing as he get bigger, he was one inch when i got him and now he's 4 and his underside is a goldish color, its conventional

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Are you sure it is a boy. That happens sometimes if it is pregnant.

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