Peng Zelu is an economic fish for freshwater aquaculture in China. It has been widely promoted for its fast growth, high meat content, and strong disease resistance. With the increase of stocking density and the change of farming methods, some diseases of Peng Zelu become more and more serious. In particular, outbreaks of acne disease in aquaculture waters in recent years have resulted in viciousness, rapid spread, and high mortality rates, which have caused large economic losses to farmers. Through the treatment practice in recent years, the author summarizes some Pengze hemorrhoids prevention and treatment techniques for reference by colleagues.
First, the cause
The pathogen is Aeromonas punctiformis, belonging to the family of Vibrio spp., belonging to the family of Vibriaceae. It exists in water all year round and is a conditional pathogen. The general water quality is turbid, the density is too large, the water quality is more fat, and fish body injuries are more likely to occur.
Second, the epidemic situation
Pengze hemorrhoids are found throughout the year, especially in spring, autumn and winter. The suitable water temperature for pathogenic bacteria is 20～25°C, which is mainly harmful to the winter fish and adult fishes. The aquaculture water bodies are free from diseased fish and the incidence history is less. After diseased fish infection, it is easy to be complicated by vertical scale disease and water mold disease, and the mortality rate after infection is 60% to 80%.
Third, the symptoms
Diseased carp and other parts of the back of the carp uplift, uplift at the scales intact, red and red skin inflammation, touch with a soft edema feeling, cut the affected area with a knife, muscle fiber dissolution. The muscle was sufu-like, sometimes the scales were erected, the fin bases were congested, the tail bent, and the affected area had watery mildew. The anatomy showed intestinal congestion, intra-abdominal muscles were red and swollen, and the microscopic examination lesions were free of myxosporidium parasitism.
Fourth, prevention methods
1. Clear pond disinfection 150-200 kg of lime with water clear pond, kill all kinds of wild fish; or mu with 100 to 150 kg of lime dry pool spill, especially the occurrence of hemorrhoids water body, in addition to For good disinfection, it must also be exposed for 10 to 15 days.
2. Fish species or adult fish stocked by the fish stocks should reduce the intensive transport time and mechanical damage as much as possible, and eliminate diseased and injured fish species or adult fish ponds. For the fish species or adult fish to be released, the pool must be sterilized. Generally, 20 grams per cubic meter of potassium permanganate is used to soak for 20 minutes, or 3% to 5% of salt is soaked for 15 to 20 minutes. Acres with 1500 to 2000 tails or 1000 to 1250 kg for adults.
3. Regulation of Water Quality Aquaculture water should ensure that the water quality is fresh, the transparency is in the range of 20 to 25 centimeters, and it is guaranteed that lime is poured once every 15 to 20 days, or another disinfectant is put in once.
4. The daily management found that the sick squid was removed in time and diagnosed by aquaculture technology experts and promptly took measures to remedy the disease.
V. Treatment Technology
Treatment of Pengze acne is usually performed with internal and external comprehensive treatment, each course of 3 to 5 days, circulating medication, until the condition is controlled.
1. External use drugs 1 Quanchiposa 0.3-0.5 g/m3 chlorine dioxide or 0.3-0.5 g/m3 dibromohydantoin for 3 to 5 consecutive days; if the condition is severe, the first day dose is doubled. 2 After one course of disinfection and antisepsis medicine, every 2 days, Quanchiposa 15 to 20 kg/mu quicklime or 2 g/m3 bleach (filter residue). 3 water quality, fertilizer, mu 15 to 20 ml concentrated glutaraldehyde Quanchiposa, use 3 to 5 days, on the contrary, with 0.3 ~ 0.5 g / cubic meter of strong chlorine (containing 30% isocyanuric acid 40% ~ 50 %) Quanchiposa, used for 3 to 5 days.
2. Internal medicine 1 Every 100 kg of fish eaten with 1 to 2 g of compound vitamins + Norfloxacin 2 to 5 g of mixed mixed 5 to 10 kg of feed, 2 times a day for 3 to 5 days. 2 Each 100 kg of fish eaten with three yellow powder 5 ~ 10g + sulfadiazine 10 ~ 15g mixed mixed 5 ~ 10 kg of feed fed 2 times a day for 3 to 5 days. 3 For every 100 kilograms of fish eaten with allicin 20 to 30 grams + sulfamethoxazole 5 to 10 grams, mix 5 to 10 kilograms of feed, 2 times a day for 3 to 5 days.
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