To raise koi fish, we must first prepare a fish tank with appropriate size. Because it can grow to about 1 meter, the bigger the fish tank, the better. If the fish tank is big, the fish can grow big. If the fish tank is small, the fish can't move, which will naturally affect its growth. In addition to size, pay attention to height to ensure sufficient water depth.

Koi is an omnivorous fish, and there are many foods that can be eaten. In the daily feeding process, animal feed and synthetic feed are mainly selected, which are rich in nutrition and more helpful to the growth of fish. Although it can also eat plant-based feed, it eats too much, and this kind of feed is not enough to meet its needs, so it needs to eat more.

In order to ensure the healthy growth of koi fish, it is necessary to change water regularly. If the feeding density is not large, it can be changed into water once a week, and if there are more fish, it should be shortened to about 3-5 days. Usually, one fifth of the water should be changed every time. Too much change may also affect the health of fish.

Koi is a large ornamental fish, and its oxygen consumption is also very high, so it needs time oxygenation. Prepare a special oxygen pump, put the air head in the fish tank, and turn it on 24 hours a day. If oxygen is insufficient, the fish may have a floating head, and they have no spirit and little appetite.