Koi fish lives in water, but its demand for oxygen is still relatively large. When oxygen is insufficient, it may die immediately. Furthermore, the density of feeding fish is relatively high, and they all need oxygen, so oxygen is easy to be insufficient. When oxygen is insufficient, oxygen should be pumped in time, and the oxygen pump should be turned on continuously all day.

The life of koi can not be separated from water, and the life of koi can only be longer if the water quality is good. If water contains chlorine and ammonia poison, they will be poisoned. To prevent toxins in water bodies, we must change water frequently, once every three days, and expose to the sun for three days before changing water to remove chlorine.

Koi is generally a kind of fish that is easy to raise, and its feeding habits are miscellaneous. However, if the food fed lacks nutrition, it will not grow fast, its resistance will decrease, and it will easily get sick and die. When choosing food, we must ensure the quality and healthy eating of koi. Animal feed is usually selected, which has high protein content and promotes its growth.

Koi can only be fattened if it grows fast, and its growth speed is related to temperature. Although it is a wide-temperature fish, the higher the temperature, the faster its metabolism, which makes it more appetizing, and the digestion speed will increase, which makes it easier to develop.