Summer is a season of high fish disease. In the prevention and treatment of fish diseases, there are often misunderstandings in the use of drugs. Many farmers usually use insecticides first, and then sterilize them. If there is no disease, then the disease will be treated. Practice has shown that these methods are not only impractical for high-density intensive culture and summer high temperatures, but also cause serious consequences of water quality deterioration, drug-induced fish disease outbreak, and fish mortality. On the one hand, the toxicity of insecticides and bactericidal drugs in hot environments will multiply, resulting in drug-induced water pollution; on the other hand, these two types of drugs will kill plankton in the water, make the water clear, and the dissolved oxygen will drop. Oxygen flood ponds or nitrite, ammonia nitrogen content increased, fish do not eat poisoning or fish disease outbreak. This is a problem that often arises in the past few years in farming. Therefore, the prevention of fish diseases in pond culture in summer needs to be vigilant. It is better to find out the cause of the disease first, to combine water quality regulation, to use internal medicine as the main method, and to supplement the disinfection of the food field. The following three items should be noted: First, the use of water quality regulation to prevent fish disease. During the continuous high temperatures in summer, the stratification of water is particularly serious. The upper and lower layers of water are not convective, the lower layer is in an anoxic state, and various harmful substances decomposed by hypoxia are generated in large quantities. The nitrite or ammonia nitrogen content increases, and various diseases occur. In this case, it is necessary to use environmentally-friendly bottoming-enhancing drugs and aerobic drugs, or drugs that reduce nitrites or ammonia nitrogen to regulate water quality, and to open aerators during the day. Second, use of oral drugs for the prevention and treatment of fish diseases. If there is a fish disease during the hot season, it is best to use internal medicines for fish disease prevention and control while carrying out water quality regulation. Third, the "medicine bath" method for the prevention and treatment of fish diseases. In the high temperature season, fish diseases should be treated with topical medicines and cannot be used on a large area to prevent sudden changes in the quality of the water and aggravate the disease. A small amount of drugs should be used to dissolve fish in the water and spilled at the food field to form a “drug bath†environment.
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