Eel frenzied swimming disease is a viral disease.

[Pathogen] Eel frenzied swimming disease is also known as frenzied running disease, dizzy head disease, etc. The pathogen is eel coronavirus.

[Symptoms and pathological changes] Affected eels first show abnormal competition for food, then stop feeding and swim alone away from the group, after which they swim rapidly in a struggling manner at the water surface for a moment, then sink into the water, then rise again and swim in a struggling manner, breathe with the mouth open, and weakly gather at the drainage outlet until death. Sick eels show muscle spasms, twisted bodies, swelling in the liver area, and congestion of the fins and chest. Necropsy shows enlarged liver and severe congestion and hemorrhage in the liver, kidney, and heart.

[Epidemiology] Eel frenzied swimming disease occurs in Guangdong and Fujian in China. It mainly harms European eels and African eels, among which eels of the current year and 2-year-old eels are most vulnerable, with high mortality, and in the same pond the large eels always die first. The epidemic season is from April to October, with the peak incidence from May to August.

[Prevention and control methods] There is currently no effective prevention and control method for this disease, and comprehensive prevention is mainly used.