Midsummer is both the golden age of fish growth and the most prone to fish disease. Since the water temperature is high at this stage, the climate is hot, organic matter decomposes quickly, plankton breeds much, and the water quality is easily deteriorated, which often leads to an outbreak of fish diseases. In the hot season, there are many factors that cause fish diseases.
First, bacterial fish disease
1. Grass carp, herring red skin disease, gill disease, enteritis disease, is caused by bacteria, the treatment of these three diseases can be used to effectively prevent sterilization Ling. In the early stage of disease, 1 packet per 50 kg of fish can be controlled.
2. Bacterial gill disease of salmon and catfish, white head and white mouth disease. (1) Bacterial gill disease: 15 to 20 kg of lime is used for Mu, and Quanchiposa can be effectively controlled. (2) Whitehead and white beak disease: The main hazard is summer fish species and fry, with furazolidone 0.1 ~ 0.2 mg / kg uniform spilling the whole pool, or every 50 kg of fish body weight 5 ~ 10 grams fed orally, the effect is satisfactory.
Second, viral fish disease
Due to virus-induced fish diseases, grass carp is the most serious hazard. Effective prevention and control measures are mainly immunization with vaccines.
Third, water quality fish disease
Water quality fish disease is fish disease caused by poor water quality. Its main symptom is pan pool, also known as anti pond. The reason is that the water quality deteriorates. Whenever there is no wind, heat, temperature rise, thunder and no rain, etc. occur. Treatment methods: Infuse clear water in time, start aerator or splash chemical aerator Ophiopogon or calcium peroxide for emergency treatment.
After correct diagnosis of fish diseases, when determining the use of medication, attention should also be paid to the following aspects in order to obtain the best results.
1. Use caution when mixing drugs. Such as bleaching powder, copper sulfate, trichlorfon can not be applied simultaneously with quicklime.
2. Prescribe the right medicine, do not use drugs.
3. The drug must be fully dissolved before application, and use a suitable container to store and dissolve the drug.
4. Rotational medication, comprehensive prevention, avoid single medication. 5. Pay attention to the quality of the drug. The deterioration of the drug is ineffective and cannot be applied. When taking medication, pay attention to the safe concentration of the drug.
In general, fish live in the water, and all kinds of activities are found in time. Therefore, the prevention and treatment of fish diseases should be done in a preventive manner. Preventive measures must be implemented throughout the entire production process. Before the stocking, clear ponds, dredging, disinfection of fingerlings, disinfection of the food field during cultivation, attention to changes in water quality and development of fishes, scientific feeding, etc., enable the fish to safely pass through the high temperature season. Can make fish health faster.
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