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Prevention and Treatment of Fulminant Hemorrhagic Disease in Silver Carp and Bighead Carp in Hill Ponds and Reservoirs

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In 2005, a large-scale die-off of silver carp and bighead carp occurred in the Mianhuatan Reservoir, affecting 200 mu with a mortality rate of 70%. The disease was prone to recurrence and difficult to control, and was diagnosed as fulminant hemorrhagic disease of silver carp and bighead carp. This disease is highly harmful, and fish farmers should attach great importance to it. I. Epidemic situation: The disease readily becomes epidemic from March to May and from August to October each year, with mortality during outbreaks reaching as high as 70-90%. II. Symptoms: "Dark floating head" often occurs, initially at

In 2005, a large-scale die-off of silver carp and bighead carp occurred in the Mianhuatan Reservoir, affecting 200 mu with a mortality rate of 70%. The disease was prone to recurrence and difficult to control, and was diagnosed as fulminant hemorrhagic disease of silver carp and bighead carp. This disease is highly harmful, @#@233@#@ farmers should attach great importance to it.

I. Epidemic situation: The disease readily becomes epidemic from March to May and from August to October each year, with mortality during outbreaks reaching as high as 70-90%.

II. Symptoms: "Dark floating head" often occurs, initially swimming 10 cm below the water surface; in severe cases, the fish respond slowly or not at all, floating at the surface day and night.

III. Preventive measures: 1. First, use quicklime to clear and disinfect the pond. 2. During the disease season, dibromohydantoin and similar substances can be splashed over the entire pond for prevention.

IV. Treatment methods: When the disease occurs, splash "Yujingqing" over the entire pond, or splash a mixed solution of urea, table salt, trichlorfon and bleaching powder over the entire pond, twice over three days.

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