To strengthen wintering and cold prevention management and disease prevention work, the following five points are mainly:
First, do a good job of disease prevention before wintering In the 30 days before the fish stops eating, conduct a comprehensive inspection of the overwintering fish, and strengthen the cold-resistant and disease-resistant ability of the fish through intensive cultivation before wintering. The bait should be full and rich in nutrition, the energy protein ratio should be higher than the rearing period, and vitamin C and the like should be appropriately increased. The amount of betaine and choline chloride should also be added to the feed to promote the metabolism of fat in the liver of fish and have a significant effect on preventing the formation of fatty liver.
Second, the ice pool before the water should be treated At present, the province's intensive culture ponds generally use high-density, high-yield production methods, feed a large amount of feed, water is relatively inadequate, many ponds exceeded organic standards. Treating the pool water before sealing the ice can effectively reduce the organic matter content in the pool water, reduce the organic oxygen consumption, and eliminate the hazards of pathogenic bacteria and toxic and harmful substances. After the fish has stopped eating, according to the local climate, the treatment of the pool water before sealing the ice can be carried out about one week before the ice is sealed, such as the use of chlorine-based disinfectant Quanchiposa.
Third, the low temperature hazards When preventing wintering pond water body temperature is a major cause of winter dead fish. Because farmed fish are difficult to survive at water temperatures below 0.5°C for a long time, and fish raised from warmer areas and high-density fishes are less resistant to low temperatures, it is important to control and reduce cold temperatures as much as possible during the overwintering management of fish. Appeared, in particular, to prevent mechanical water from causing a sharp drop in water temperature, and not to lower the temperature of the bottom layer below 2°C.
IV. Increasing dissolved oxygen in water The lack of oxygen in water bodies is also a major cause of overwintering and death of fishes in ponds. It is necessary to maintain the amount of phytoplankton and the dissolved oxygen in the water in the overwintering ponds relatively stable, increase the illumination of the water layer, control the phytoplankton, and prevent Organic matter is too high and increases dissolved oxygen.
Fifth, after the ice-melting fish disease early prevention of fish overwintering period does not eat for a long time, the constitution is very weak. After the ice melts, as the water temperature rises, various pathogenic bacteria or their spores, eggs, and larvae gradually develop in the water body and multiply, making the fish susceptible to attack by pathogenic bacteria, such as water mildew, vertical scale disease, and white cloud disease. , causing massive fish deaths. In order to reduce losses, it is necessary to actively take measures after melting ice to prevent the occurrence and prevalence of fish diseases.
First, do a good job of disease prevention before wintering In the 30 days before the fish stops eating, conduct a comprehensive inspection of the overwintering fish, and strengthen the cold-resistant and disease-resistant ability of the fish through intensive cultivation before wintering. The bait should be full and rich in nutrition, the energy protein ratio should be higher than the rearing period, and vitamin C and the like should be appropriately increased. The amount of betaine and choline chloride should also be added to the feed to promote the metabolism of fat in the liver of fish and have a significant effect on preventing the formation of fatty liver.
Second, the ice pool before the water should be treated At present, the province's intensive culture ponds generally use high-density, high-yield production methods, feed a large amount of feed, water is relatively inadequate, many ponds exceeded organic standards. Treating the pool water before sealing the ice can effectively reduce the organic matter content in the pool water, reduce the organic oxygen consumption, and eliminate the hazards of pathogenic bacteria and toxic and harmful substances. After the fish has stopped eating, according to the local climate, the treatment of the pool water before sealing the ice can be carried out about one week before the ice is sealed, such as the use of chlorine-based disinfectant Quanchiposa.
Third, the low temperature hazards When preventing wintering pond water body temperature is a major cause of winter dead fish. Because farmed fish are difficult to survive at water temperatures below 0.5°C for a long time, and fish raised from warmer areas and high-density fishes are less resistant to low temperatures, it is important to control and reduce cold temperatures as much as possible during the overwintering management of fish. Appeared, in particular, to prevent mechanical water from causing a sharp drop in water temperature, and not to lower the temperature of the bottom layer below 2°C.
IV. Increasing dissolved oxygen in water The lack of oxygen in water bodies is also a major cause of overwintering and death of fishes in ponds. It is necessary to maintain the amount of phytoplankton and the dissolved oxygen in the water in the overwintering ponds relatively stable, increase the illumination of the water layer, control the phytoplankton, and prevent Organic matter is too high and increases dissolved oxygen.
Fifth, after the ice-melting fish disease early prevention of fish overwintering period does not eat for a long time, the constitution is very weak. After the ice melts, as the water temperature rises, various pathogenic bacteria or their spores, eggs, and larvae gradually develop in the water body and multiply, making the fish susceptible to attack by pathogenic bacteria, such as water mildew, vertical scale disease, and white cloud disease. , causing massive fish deaths. In order to reduce losses, it is necessary to actively take measures after melting ice to prevent the occurrence and prevalence of fish diseases.
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