Viral disease: wild swimming disease of eel
[pathogen] Anguilla Anguilla (Anguilla Anguilla) is also known as crazy running disease, faint head disease and so on. The pathogen is eel coronavirus.
[symptoms and pathological changes] the diseased eel first appeared abnormal grazing, then stopped feeding and swam alone, then sank into the water after struggling on the surface for a while, then floated for a struggling swim, opened its mouth to breathe, and gathered feebly in the sewage outlet until death. The diseased eel has muscle spasm, twisted body, enlarged liver area, hyperemia of fins and chest. Autopsy showed that the liver was enlarged and the liver, kidney and heart were severely congested and bleeding.
[epidemic situation] Anguilla Anguilla frenzied disease occurred in Guangdong and Fujian. It is mainly harmful to European eel and African eel, among which eel and 2-year-old eel are the most vulnerable with high mortality, and big eel always dies first in the same pond. The epidemic season is from April to October, and the peak is from May to August.
[prevention and treatment] at present, there is no effective method for prevention and treatment of this disease, mainly for comprehensive prevention.
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Fish bream disease in fragrant fish culture
The pathogen is fish fish. The symptoms of the disease are parasitic on the body surface and gills of the fragrant fish, absorbing the blood of the fragrant fish and making the fish lose weight gradually. The fish fish stabs the fish's skin with mouth thorns and jaws while feeding, causing many wounds and then being infected with microbes and causing death. Prevention and treatment of ① before stocking, fish ponds were cleaned with quicklime to kill adults, larvae and eggs in the water. ② was bathed in 30ppm formalin diluent for 12 hours for 3 days. ③ uses trichlorfon 0.
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Guidelines for the use of pollution-free fishery drugs
Although fishery drugs can treat the diseases of farmed fish, shrimp and crabs, because aquatic products will eventually be put on the table of the people, so the safety of drugs used for disease prevention and treatment must be paid attention to. In order to prevent harmful substances contained in aquatic products from harming human health, the Food Hygiene Law stipulates that aquatic products such as fish, shrimp and crabs shall not contain antibiotics or synthetic antimicrobial agents or other substances harmful to human health. In order to prevent drug residues, it is necessary to understand the correct method of drug use and drug withdrawal period. The relevant state departments have promulgated the "pollution-free Food"
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