The life span of koi fish can reach 60-70 years. The reason why this kind of fish can live so long is that it is close to carp, has strong adaptability, and is larger, so the life span of big fish is generally longer. In artificial feeding, we must pay attention to keeping the water quality clean and hygienic, which is also helpful to prolong its life. Animal feed is mainly selected for daily feeding, and proper light should be provided.

1. Water quality: Water is as important to koi fish as air is to human beings, and it is indispensable. Good water quality can promote the growth of koi fish. Koi fish grows well and its beard naturally grows well. Under normal circumstances, in order to maintain good water quality, it is necessary to change water about twice a week. If the weather is sultry, it is necessary to increase the number of water changes, three to four times a week.

2. Feeding: Reasonable feeding can also promote the beard growth of koi fish. Koi does not feel full. If you eat too much, koi is easy to die. During the maintenance period, it is enough to feed once a day.

3. Illumination: If the light for maintaining koi is too dark, the growth of koi will be affected. At this time, people need to add light, and incandescent lamps or metal halide lamps can be used to make up for the light. Artificially adding light means replacing sunlight with lamps to ensure the illumination demand of koi fish. After the light demand of koi fish is met, the beard will naturally grow well.