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.
cause of death:
Small fish species and poor health
During the wintering period, most fish do not generally feed, have less activity, and have 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.
Severe lack of oxygen in wintering waters
Causes of hypoxia are: (1) The pool is lean and the number of phytoplankton is low. (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.
Fish injury
When pulling nets and ponds, due to poor operation, the fish may be injured or the scales may be wiped off; the invasion of the bacteria is also easy to die.
Poor management
Failure to check the amount of dissolved oxygen in the water body, fish movements and changes in the water body, or the failure to take any remedial measures in time has led to the death of fingerlings. 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 filling of water or oxygen
For a long time, blindly circulating flushing or oxygenation caused the pond water temperature to drop rapidly and the fish was frozen and frozen to death.
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