Koi generally does not die without oxygen for one day. It is best to prepare an oxygen pump for raising koi fish, because it is relatively large and consumes a lot of oxygen. If there is an oxygen pump, the fish will breathe more smoothly. If there is no oxygen, it may cause the fish to float. It should be noted that although koi fish is a wide-temperature fish, it should also pay attention to heat preservation to avoid large changes in temperature, otherwise the fish may get sick.

1. Open the tank: The new fish tank bought generally needs to open the tank, and a nitrification system should be established when opening the tank, so that the ammonia nitrogen in the water can be properly treated. The establishment of nitrification system is mainly nitrifying bacteria, which needs a certain amount of oxygen for its growth, so it needs to explode oxygen for a period of time. When the water quality changes from turbidity to clarity, it means that the nitrification system is completed.

2. Daily life: You can also turn on the oxygen pump when raising fish at ordinary times, but don't keep it on all the time. It is enough to turn it on for 2-4 hours every day. Only in summer or rainy weather, when the air pressure is relatively low, you need to turn it on for about 4-6 hours. In addition, if there are aquatic plants in the tank, it needs to be opened for 1 hour before nightfall.

3. Cure diseases: When a fish is sick, it needs to explode oxygen to ensure its breathing. If the oxygen pump is not turned on, some drugs will consume oxygen in the water after being put into use, which will lead to lack of oxygen for the fish, which is unfavorable to its recovery.