Generally, when a fish just dies, because the swim bladder loses its regulating function, its body will become stiff at the same time. At this stage, it will sink to the bottom of the water. After autolysis and decay, it will produce some gas, and the density will be reduced, and it will naturally float up. Therefore, the dead fish raised at home usually sink to the bottom, but the dead fish seen outside are floating on the water surface.
1. Fish disease: Fish will inevitably get sick in the process of growth. If not treated in time, it may lead to deterioration of the disease, or even death. In general, when fish are found to have abnormal performance, such as rubbing tanks or shaking fins, it is necessary to check to see if there are any lesions, if so, change water to heat up salt, and use drug immersion treatment.
2. Anoxia: Fish live in the water and need to breathe. If the dissolved oxygen in the water is low, it will die. Usually, if the water body is anoxic, the fish will have the performance of floating head, at this time, oxygen is needed in time. The oxygenation pump can be turned on for 2-4 hours every day, and the oxygenation pump does not need to be turned on all day.
3. Pollution: If the water body is polluted, it will also affect the health of the fish, and may cause their death in serious cases. There are many reasons for water pollution, such as changing water from unknown sources, or feeding too much feed at ordinary times, resulting in a large number of microorganisms or algae reproduction, will affect water quality, so we must pay attention to.
