Viral disease: hemorrhagic open mouth disease of eel
[pathogen] the pathogen of hemorrhagic open mouth disease of eel is a kind of deoxyribonucleic acid virus.
[symptoms and pathological changes] the diseased eel showed severe bleeding, mainly in the cranial cavity, followed by oral and head muscle bleeding. Diseased fish osteoporosis, prone to bone fragmentation, cranial cavity appears "open skylight"; the joint between tooth bone and joint bone is loose, the mouth is often open, can not be closed. Liver, spleen, kidney enlargement, extreme anemia. The blood of diseased eel was observed by ultra-thin section, and virus particles could be seen in blood cells.
[epidemic situation] cases of hemorrhagic orifice disease of eel have been reported in Fujian and Guangdong. It mainly harms eels over 1 year old. The incidence season is from May to October, the peak of incidence is from July to August, and the mortality rate can reach 90%.
[prevention and treatment] at present, there is no effective prevention and treatment of the disease, mainly on the basis of comprehensive prevention, the whole pool is sprinkled with fungicides to prevent bacterial infection and aggravate the disease.
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Diagnosis and treatment of infectious serositis in ducks
Duck infectious serositis is a contagious, acute or chronic infectious disease caused by Riemerella anatipestifer, which mainly affects 8-week-old ducklings. The disease is characterized by fibrinous pericarditis and fibrinous pneumocystitis. It is an infectious disease that seriously harms ducklings. (1) the most acute clinical symptoms of the affected ducks died suddenly without seeing the symptoms. The main clinical manifestations of acute cases are: depression, lack of food, refusing to eat, lying together, weak legs, unwilling to walk, ataxia, head upward and backward when lying on the ground.
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Matters needing attention for releasing fish species in early spring
1. The quality of fish put into the fish requires the same age, the same specification, no injury, complete scale fins, strong traceability, Gill cover not open after leaving the water, beating more than. two。 Fish fingerling disinfection should be paid attention to: ① drugs should be used now, dispensing should use clear water, avoid fat water, and avoid direct sunlight when medicine is washed. The dose of ② should be accurate to avoid underdose or overdose. ③ soaking time should be appropriate. When fish species are found to be poisoned, water should be added immediately
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