Water level of peony in koi fish.

1.5 meters. The ideal depth of the pond for raising koi fish is 1.5m, and the larger the area, the better, and a large koi fish can be raised. There is no minimum standard. Small ponds can raise small fish, and the water depth is 50 cm. A pond with a square of 1 meter can raise four koi fish with a length of 20 cm.

Koi fish is omnivorous. Koi fish is docile by nature, likes to live in groups, is easy to raise, and has strong adaptability to water temperature. It can survive in the water temperature environment of 5-30℃, and the growth water temperature is 2 1-27℃.

Besides the water temperature and the richness of food will affect the growth rate of koi fish, the growth of female and male fish is also very different. The age of koi fish, like most fish, determines the number of scales, which indicates the age of koi fish.