During the wintering season, especially in some small fish ponds, the general mortality rate is as high as 10% to 20%. The causes of death and remedial measures are as follows. Causes of death: Small fish species, poor health in the wintering period, most fish are generally not how to feed, activity is also less, slow metabolism. It mainly sustains the accumulation of fat, protein and other nutrients in fish. In particular, fish species with too small specifications have poor health and cause death due to diseases such as infection with water mold during the process of pulling nets and pooling. The causes of hypoxia caused by severe hypoxia in wintering water bodies are as follows: (1) The pool water is thin and the number of phytoplankton is small. (2) Due to the accumulation of fertilization, feeding, and fish metabolites in the water body, organic matter increases and the oxygen consumption is too large. (3) Too much oxygen is caused by excessive density of wild fish or stocked fish species. (4) The influx of living or factory sewage into the water body causes a large amount of oxygen consumption and causes insufficient dissolved oxygen. (5) Poor soil water retention performance, a large drop in water level, shallow water causes hypoxia, and fish activity space is reduced. When the fish body was injured in the net and pond, due to poor operation, the fish body was injured or the scales were wiped off; the invasion of the bacteria was also easy to die. Poor management did not promptly check the amount of dissolved oxygen in the water body, fish movements and water changes, or found that the adverse state did not take any remedial measures in time, resulting in the death of fish species. Overwintering ponds, shallow water levels, excessive ice thickness, and ice and snow cover can also cause oxygen deficiency in the pool water and cause the fish to suffocate and die. Improper water injection or improper oxygenation, blindly circulating flushing water or increasing oxygen for a long time caused the pond water temperature to rapidly drop, and the fish was frozen and froze to death.
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