Prevention and treatment of oral and mandibular furuncle of cultured freshwater Pomfret

The pathogen may be bacteria, but it has not been isolated and identified. The main conditions for the pathogen to cause the disease are the oxidative deterioration of meat residue and oil sauce in pellet feed and the deterioration of water quality after long-term storage.

[symptoms] the food intake of diseased fish decreased. Swimming slowly on the water surface, slow response, sometimes spasms, dead fish oral lower jaw are long furuncle, furuncle site is the same, some furuncle swelling bulge, some furuncle swelling face ulcer, some mandible base along the mouth edge also has mung bean-sized boils, some sick fish abdomen is swollen, abdominal scales are stretched out, hands touch like a file, cut open with a lot of ascites.

[epidemic and harm] at present, the disease is mainly seen in large-size fish, usually occurs in July-August, the course of the disease is about 10 days, the incidence rate is more than 30%, and the mortality rate is high. The mixed culture of silver carp and grass carp did not cause the disease.

[diagnosis] the diagnosis can be made by examining the furuncle and ascites in the mouth of the diseased fish.

[prevention] ① maintains good water quality. ② does not feed oxidizing spoiled bait.

[treatment] ① replace part of the pool water and sprinkle it with 1 mg / L bleach in the whole pool. ② washed the diseased fish with 8 mg / L local toxin solution for 15 minutes. When necessary, ④ should be injected with penicillin with a dosage of 50, 000 ~ 90, 000 units per kilogram of body weight.