I. Management of open-air ponds 1. Do not warm the sun at night because the light will lure the fish to the cold surface of the pond and freeze and die. Do not open the aerator as much as possible to reduce the convection on the water below the pond, thereby slowing down the water temperature at the bottom of the pond and achieving the purpose of antifreeze. 2. In the freezing or rain and snow weather, no operations such as pulling nets, transporting, and diverting ponds will be carried out so as to avoid secondary damage to the fish body caused by mechanical damage. 3. To insist on daily morning, mid-night and evening patrols to monitor water temperature and water quality, we must promptly clear dead individuals so as to avoid dead fish rot and water damage. 4. To strengthen water quality management. To remove icing on the water surface of the pond in time; change the water 1 or 2 times before and after noon on sunny days every month, but do not add water to prevent the temperature of the water from falling during cold storms; after water temperature rises and stabilizes, use a small irritating iodine preparation to sterilize the water, or mu. Sprinkle 15 kg of quicklime or use a bottom modifier. In ponds with frostbite or dead fish, do not use antiseptics immediately to prevent stress reactions and accelerate death. Second, the winter shed management 1. The snow on the shed must be removed promptly, the damaged film should be repaired, the thermal insulation equipment should be checked, and the fuel needed for heating should be added to ensure that the greenhouse is normal. 2. Before and after noon when the weather warms up, the two ends of the film set off 2 to 3 meters to distribute the air and seal it before sunset. 3. Feeding, generally fed at about 3 o'clock in the afternoon, feeding multi-dimensional or immune enhancer concentrate feed to enhance the fish's ability to resist cold. 4. Do a good job in water quality management. Change the water 1 or 2 times a month before and after noon on a sunny day. Sprinkle 15 kilograms of quick lime 1~2 times per month. Third, recovery after disaster When suffering from frost damage, take timely measures to reduce losses and resume production as soon as possible. Generally, it starts after the temperature rises and the pond water temperature stabilizes above the lower limit of the cultured biological optimum temperature range. 1. Pay close attention to the restoration of facilities and restore aquaculture production capacity as soon as possible. 2. Check the amount of fish and adjust the density. The number of fish stocks can be determined based on the number of dead fish or the number of dead fish. Compared with before the disaster, the loss is less than 50%, and other types can be properly added and intensively cultivated; if the loss is greater than 50%, take measures such as pooling (box). 3. Do a good job of preventing diseases and prevent epidemics. Remove dead fish (including buried mud) in time to avoid damaging the water. Use zeolite powder or other modifiers or biological methods to clean the bottom of the pool. Strengthen monitoring and report major epidemics immediately to prevent epidemics. Lab Instruments,Laboratory Products,Lab Safety Equipment,Laboratory Instruments ZHEJIANG FOMOS MEDICAL TECHNOLOGY CO.,LTD. , https://www.ifomos.com