Over-wintering of fish in fish ponds can cause fish to die, but high dissolved oxygen is also a major cause of bubble disease in fish. During the early and mid-overwintering seasons, only the amount of dissolved oxygen in the overwintering pool is generally emphasized. However, in the later period, that is, two months after the Spring Festival, the temperature and water temperature picked up, and the ice in wintering pool remained to be dissolved. At this time, if the dissolved oxygen in the water body is too high, the oxygen in the water under the ice overflows, and the partial pressure of oxygen rapidly decreases. At this time, the partial pressure of oxygen in the fish is still high, and oxygen rapidly overflows from the body to the outside of the body. The diseased fish had some air bubbles in the intestine. The scales were erected like vertical scales. There were also bubbles in the capillary micro-vessels. The arterial balloon was inflated, the orbital side was inflated, and the mesentery and liver surface were also distributed. The diseased parts of farmed fish are chiefly caudal fins, dorsal fins and vertical scales, and are also highly inflated with fish gills. Because the fish body with bubble disease loses its balance, it affects its physiological function until it dies. In particular, after the Spring Festival, water and ice transparency is good, and there are many aquatic plants. Before the Spring Festival, there is no wintering pool lacking oxygen. It is necessary to pay attention to supersaturation of oxygen. When the dissolved oxygen in the water is more than 20 mg per milliliter, it should go to the pool. Water injection to reduce the amount of dissolved oxygen in the water to prevent bubbles in the fish. In wintering ponds where there are no oxygen measurement conditions, it is not easy to detect the disease by observing various biological activities in the water, and it is often found after the dead fish that it has become a bubble disease. Therefore, it is necessary to take precautions. Once dead fish is found, it is necessary to immediately fill the water, which can have an immediate effect.
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