What Does It Mean When Goldfish Turn Black?

By Staff WriterLast Updated Apr 7, 2020 11:03:25 PM ET
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Miroslaw Kijewski/E+/Getty Images

The most common reasons for goldfish to turn black are genetics and ingestion of colored food. Dark environments also cause goldfish to produce additional melanin, which results in a change in pigment. Disease is uncommon, but in certain cases, diseased goldfish turn black.

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