1. Pathogens: Aeromonas sobria, Aeromonas hydrophila and other Gram-negative bacilli.
2. Symptoms: In the early stages of the disease, yellow or yellow-white sticky materials are found on the outer rim and caudal peduncle of the fin, followed by congestion, inflammation, and erosion at the caudal fin and caudal peduncle. In severe cases, the tail fins rot away and the tail shank muscles are bleeding and ulcerated. Exposed to death. In the lower water temperature season, it is often secondary to aquatic mold infection.
3. Epidemic situation: after the tail injury, infection by skin contact, hazards of eel, grass carp, tilapia, clams and other freshwater fish, can cause large-scale death of fish species; adult fish also suffer from this disease, but the general mortality rate is low.
4. Diagnosis: According to the symptoms and prevalence of the initial diagnosis, the diagnosis must be isolated pathogens.
5. Control methods: In the early stage of the disease, the disinfectant is sprayed 1 to 3 times in the whole pool and it can be cured. However, when the disease is serious, antibiotics should be taken internally and taken together. Every 100 kg of fish should be fed with 15 grams of Yutai No. 8 drug and be fed on two occasions in the afternoon and fed for 5 to 7 days. However, when broodstock is severely ill, it has lost its appetite. In addition to disinfecting drugs, it is necessary to simultaneously perform intramuscular injection of streptomycin sulfate and inject 20 ml of fish per kilogram of fish. If necessary, it can be injected again.
If the pathogen is columnar flexor bacilli, the therapeutic medication is as follows:
External medicine: Chlorine disinfectant is poured out of the pool.
Internal medicine:
(1) Add 2 to 3 grams of compound sulfamethoxazole per kilogram of feed, and feed it for 3 to 5 days. Feed it once every morning and afternoon.
(2) Fish per kilogram of feed should be fed with 3 to 4 g of enteric-fighting spirit. Feed 3 to 6 days and feed 2 times a day.
(3) Add 2 to 3 grams of sulfamethoxazole-6-dimethoxypyrimidine per kilogram of feed, feed it for 4 to 6 days, and double the dose on the first day and feed it once a day.
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