What color is the black koi fish fish belly?

White, yellow, red, light gold. Black koi fish (scientific name: Carassius auratus) is a common ornamental fish, and its belly color will be different due to species, environment and individual differences. Generally speaking, the abdominal color of black koi fish can be divided into the following categories:

1, first white: this is one of the most common abdominal colors, especially in ordinary black koi fish.

2. Secondly, yellow: Some varieties or individuals may have yellow tones.

3. Then, red: There are also a few varieties or individuals whose bellies are red.

4. Finally, orange and yellow: Some special strains or hybrid offspring may have orange and yellow patterns.