Fish themselves live in water, but they don't breathe. Their gills are respiratory organs, which can absorb oxygen from water. If the dissolved oxygen in the water body is insufficient, the fish will die of hypoxia. At this time, there will be floating head, which needs to be supplemented with oxygen in time. Usually, if you raise small fish at home, you don't need an oxygen pump, but big fish need to be oxygenated every day.

1. Daily: As mentioned above, raising big fish needs oxygen, because the bigger the body, the higher the oxygen consumption, and the higher the dissolved oxygen in the water body. Once the dissolved oxygen drops, you will feel uncomfortable. In this case, it is necessary to oxygenate every day, but don't keep it on all the time. It is enough to drive for 2-4 hours. If it is hot weather or continuous rainy days, it can be driven for several more hours.

2. Culture of bacteria: Fish culture should not only take good care of fish, but also establish a good ecological cycle, which is also helpful to the health of fish. Cultivating bacteria is one of the essential steps. Establishing a good nitrification system can transform harmful substances in water. As aerobic bacteria, nitrifying bacteria need to turn off the lights and explode oxygen to accelerate its reproduction.

3. Illness: After fish get sick, their vitality is not good. At this time, oxygenation can improve its metabolism and accelerate the discharge of harmful substances. Moreover, bacteria in water also consume oxygen, which can easily lead to insufficient oxygen in water, and may even aggravate the disease.