If there is insufficient oxygen in the water, the fish will die within 5- 10 minutes. If the content is not very low, it may last longer. Fish live in water, but they also need to breathe. They can absorb oxygen from the water through fish gills, so the lack of dissolved oxygen in the water will also lead to the death of fish due to hypoxia. If there are fewer fish, they can be oxygenated by changing water. If there are more fish, an oxygen pump must be used. First, if there is insufficient oxygen in the water, how long will the fish die? If there is insufficient oxygen in the water, the fish will die within 5- 10 minutes. If the content is not very low, it may last longer. Fish live in water, but they also need to breathe. They can absorb oxygen from the water through fish gills, so the lack of dissolved oxygen in the water will also lead to the death of fish due to hypoxia. If you have few fish, you can fill them with oxygen by changing water. If you raise more fish, you must use an oxygen pump.

Second, what are the methods of increasing oxygen? 1. oxygen pump: oxygen pump is the most commonly used oxygenation method. With it, raising fish at home can completely avoid hypoxia. Generally, the oxygen pump should be turned on all day, but if the lack of oxygen is not particularly serious, it is also feasible to turn on the oxygen pump in stages, with two hours in the morning and two hours in the afternoon. If it is summer or rainy weather, the time to turn on the oxygen pump will increase.

2. Oxygen-increasing tablets: Oxygen-increasing tablets are also commonly used to increase oxygen, but they are rarely needed for family fish farming. Mainly used in aquaculture, it is an emergency oxygen-increasing method for fish ponds. It should be noted that oxygen-increasing tablets may have some side effects, such as improving the alkalinity of water or affecting the growth of algae in water.

3. Aquatic plants: Aquatic plants can increase the oxygen content in water through photosynthesis, so some aquatic plants can be planted in fish tanks. However, it should be noted that fish consume far more oxygen than they provide, and in the absence of light, breathing will also lead to an increase in oxygen consumption. So although it has the function of increasing oxygen, it still needs other means to supplement it.