Under the premise of normal feeding, the oxygen content in the water is enough for it to breathe. In this case, it does not need oxygen. If the water quality deteriorates or there are too many cultured fish, they can not live normally only by the dissolved oxygen in the water. In order to ensure the healthy growth of fish, it is necessary to inject oxygen into the water. When their living conditions get better and they can breathe normally, they can stop oxygen. The oxygen pump had better not be on all the time. As long as the tank is large and the breeding density is not large, and the fish are not anoxic, it can be turned off.
The life span of zebrafish is not very long, even healthy fish can only live for 2 to 3 years. And the external environment will also affect its life span. If the tank is large and the number of fish is small, the oxygen content in the water can ensure that it can breathe normally. Then they can live for two to three years. Even if it is given oxygen, its life will not exceed three years. If the oxygen content in the water is very low, it can not guarantee that it can breathe normally, and if it is not given oxygen, it will die because of extreme hypoxia. Even the fish with strong vitality can not last more than three days.
