During the dry season, the low water level in the breeding ponds will result in a high density of cultured species and an increased risk of mutual infections. If diseases occur, the rate of infection will accelerate. Therefore, to prevent outbreaks of fish diseases in particular, we must implement “comprehensive prevention and active treatmentâ€. policy. The occurrence of fish disease is not an isolated cause. It is the result of the interaction of the fish body, pathogens and living environment. Therefore, prevention of fish diseases must start from three aspects. We must pay attention to the eradication of the source of infectious diseases and cut off the infection as much as possible. Invasive approaches, but also to improve the fish's resistance to disease, but also to improve the living environment, take comprehensive preventive measures. Daily management During the drought, it is a period of high incidence of fish diseases. Each farmer should insist on daily inspection of the pond several times a day, pay attention to daily management, closely observe the changes of farmed species, find problems, correctly respond, skillfully spend the drought period, and reduce drought losses. In the daily patrol pond, attention should be paid to the observation of fish activities and eating conditions, and abnormalities should be detected in time for fish disease examination and corresponding treatment. Regularly sprinkle lime and microbe water quality improver on the aquaculture water, enhance the anti-stress ability of the fish, and disinfect the water body with a irritating disinfectant to avoid the instability of the aquaculture water and create new stress on the farmed fish. Stress management Stress (stress, stress) management itself is the core technology for healthy development, and stress management should be strengthened during drought. The fulminant fish disease usually occurs in the environment, after the occurrence of stress, especially when the water quality is unstable (the quality of water changes), the climate is very poor, the pH value changes greatly, the temperature difference is large, and the stress intensity is strong. Most likely to infect patients. Quanchiposa Sanbao High Stability VC (150g/mu - 250g/mu), Glucose (2kg/mu/m3kg/mu/m water depth), Astragalus polysaccharide (100g/mu) to enhance the culture The anti-stress ability of fish. And after 4 hours to 6 hours of sprinkling, use a small sterilizing disinfectant to disinfect (pay attention to the selection and use of disinfectants), culling bacteria and viruses, and controlling the outbreak of the disease most effectively under the double tubes. Oxygenation measures With the increase of culture time, the accumulation of dirt makes the heterotrophic bacteria at the bottom of the pond a predominant bacterial group, which causes severe oxygen deficiency at the bottom of the pond. As a result, nitrites and ammonia nitrogen accumulate due to incomplete oxidation (the occurrence of poisoning). The most serious consequence of hypoxia is the malignant proliferation of pathogenic bacteria Aeromonas hydrophila, and the lack of oxygen has greatly reduced the immunity of farmed fish, which makes it extremely prone to disease outbreaks. In order to keep the bottom dirt inventory to a minimum, the dissolved oxygen must be sufficiently high to oxidize and decompose the harmful substances on the water bottom. The most effective means is to improve the water circulation and eliminate the lack of oxygen at the bottom. The method is to use the bottom aerator and it is hot and stuffy. On rainy days and at ordinary times between 12:00 pm and 12:00 pm, Quanchiposa 200 grams/mu -300 grams/mu of flake-shaped oxygenating agent containing sodium percarbonate as the main ingredient. Crisis management During the drought, crisis management must be implemented to create a good ecological environment, and to implement nutrient-containing (nutrient-containing drugs) and beneficial microorganisms to become dominant population control technologies, so as to help strengthen the disease resistance of farmed fish and health Growing up is not conducive to the reproduction of pathogenic microorganisms. Usually in the climate change, especially in the dry season, the pond is most vulnerable to oxygen deprivation that causes a large number of pathogenic bacteria to multiply and have an outbreak. The outbreak of pathogens (bacteria and viruses) is caused by lack of oxygen (low dissolved oxygen) and sediment accumulation (providing nutrition and pathogens of pathogens). The amount of bacteria (toxicity) in water is high, and it causes resistance to stress in farmed fish. The force drops. For these factors, the crisis management should be implemented in advance according to the weather conditions and the farming experience, and response measures should be taken: 1. Mix and feed high-quality stable VC (1g/kg-2g/kg feed) to enhance disease resistance and anti-stress ability of farmed fish. 2. Increase the dissolved oxygen at the bottom of the pool (in the middle of the night, the use of sodium percarbonate as the main component oxygenation agent 200 g/mu - 250 g/mu) will help enhance the vitality of farmed fish, which is not conducive to bacteria (such as vibrio, hydrophile air alone Proliferation. 3. The use of small sterilizing disinfectants to kill bacteria and viruses helps maintain water quality, which is the most important part of the breeding process. 4. Reduce the amount of feeding, reduce residual baits and dirt, and reduce the nutritional supply of pathogenic bacteria. 5. If diseases of farmed fishes occur, Sanbao High-stability VC (200 g/mu) should be immediately spit out in Quanchipue to improve the anti-stress ability of farmed fish, which is conducive to the healthy recovery of farmed fish and the disinfection effect of disinfectants. . 6. If you use aerobic beneficial microorganisms (such as nitrifying bacteria, Bacillus, etc.) to improve water quality, you should pay attention to the use of microbial preparations before the night before the use of sodium perchlorate as the main ingredient of the sheet oxygen enhancer, and before use 3 The use of a rapid oxygenating agent and continuous activation of the oxygen aerator for hours to 4 hours facilitates the efficacy of the aerobic microorganism preparation and achieves the effect of improving the aquaculture water quality. 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