Zebrafish can not get oxygen through water ventilation, but can only rely on dissolved oxygen in water to breathe. If the volume of the fish tank is relatively large and a filter device is installed, the dissolved oxygen in the water can ensure that the fish can breathe normally. In this case, oxygenation is not required. But there are exceptions. When the density of fish in the tank is too high or the tank is very small, the oxygen in the water can not meet their needs. At this time, it must be oxygenated, otherwise it will be in a state of hypoxia for a long time, which will easily lead to the death of fish. If the lack of oxygen is not very serious, the installation of filters can also increase the amount of oxygen in the water. When the situation is serious, oxygen pump can be used to pump oxygen into the water.
The use of oxygen pump needs to be determined according to the needs of the fish. If there are a lot of fish in the tank, they will consume more oxygen. In this case, it is better to keep the oxygen pump on for 24 hours. If the number of fish is small, only occasionally open the oxygen pump can be. Generally speaking, the filter device will have the function of increasing oxygen. Therefore, if the fish tank is equipped with a filter device, the oxygen pump does not need to be on all the time.
