1. Adequate oxygen: Although big koi fish lives in water, 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 given in time.

2. Good water quality: The life of big 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.

3. There is food: Koi is a kind of fish that is easy to raise in general, 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.

Koi can grow to more than 1 meter long. This kind of fish is an ornamental fish cultivated by carp, so it is relatively large. If it is raised artificially, it is best to prepare a large fish tank, so that the fish can swim and grow bigger at the same time. It does not require high temperature, and the water temperature can be raised between 5-30 ℃, but dissolved oxygen must be sufficient.