The color of koi fish is naturally formed and will gradually change color during its growth. This kind of fish is bred by carp. After several generations of selection, their colors are gradually enriched. However, some koi carp are dyed, and their color will gradually dissipate, which is irreversible. In addition, if there is something not in place in feeding, it may also cause the fish to fade, so it must be taken care of carefully at ordinary times.

1. Increase light: Koi can't grow without light, and insufficient light will lead to metabolic disorder and fading. At this time, it needs to be supplemented with light. If it is inconvenient to irradiate natural light, it can be supplemented manually. Use incandescent lamps, LED lamps and other lamps for supplementary illumination.

2. Increase animal feed: Raising koi fish requires not only fish food, but also animal feed. If animal feed is not fed, koi will suffer from malnutrition and fade slowly. Generally, it is fed twice a week. In the choice of feed, red worms, earthworms, shrimps and other insects can be used. Every year from June to September, the appetite of koi will increase. At this stage, you can eat once a day, and the feeding time is morning or evening.

3. Add old water or plant aquatic plants: If the water in which koi is cultivated is too clear and there is nothing in the water, koi may fade. In view of this situation, it is necessary to add colored things, such as aquatic plants, ceramsite and so on, to the fish tank for breeding koi fish. Try to improve the natural environment and let koi adapt slowly, so that the color of koi will change back slowly.