It's too hot. Can a fish pond kill more than a dozen fish a day?

It should be grass carp hemorrhagic disease, which is caused by reovirus infection. The main symptoms are: sick fish swim alone in the water, swimming slowly and not eating. The fish body is black, and there are different degrees of congestion and bleeding on the top of the head, jaw, mouth, orbit, gill cover, fin and fin base. Peeling off the skin, you can see that the muscles are bloodshot and bleeding in spots or sheets, and in severe cases, the muscles of the whole body are bright red. The main target of the damage is grass carp, and the morbidity and mortality can reach more than 70-80%. The epidemic time is from May to 10, and it is most popular when the water temperature is 25-32 degrees.

Prevention and control methods: ① Strictly implement the quarantine system, and do not import or transport virus-carrying fry, fingerling and parent fish. (2), remove excess sludge at the bottom of the pool, and thoroughly disinfect with quicklime or bleaching powder. ③ Inject grass carp freeze-dried vaccine before stocking or when crossing the pond. (4) Disinfect with chlorine dioxide, dibromomarine bacteria, bromochloromarine bacteria or strong chlorine essence every half a month in the onset season. ⑤ Sprinkle rhubarb in the whole pool at the onset, with a water depth of 2kg per mu per meter (rhubarb is first decocted with appropriate amount of water 15min). ⑥. Every 100 kg of fish was fed with 0.5 kg of Chinese herbal medicines such as rhubarb, scutellaria baicalensis, phellodendron amurense and isatis root (used alone or in combination) and 0.5 kg of salt for 7 days. We can see that Wang Xing fish medicine should be grass carp hemorrhagic disease, which is caused by reovirus infection. The main symptoms are: sick fish swim alone in the water, swimming slowly and not eating. The fish body is black, and there are different degrees of congestion and bleeding on the top of the head, jaw, mouth, orbit, gill cover, fin and fin base. Peeling off the skin, you can see that the muscles are bloodshot and bleeding in spots or sheets, and in severe cases, the muscles of the whole body are bright red. The main target of the damage is grass carp, and the morbidity and mortality can reach more than 70-80%. The epidemic time is from May to 10, and it is most popular when the water temperature is 25-32 degrees.

Prevention and control methods: ① Strictly implement the quarantine system, and do not import or transport virus-carrying fry, fingerling and parent fish. (2), remove excess sludge at the bottom of the pool, and thoroughly disinfect with quicklime or bleaching powder. ③ Inject grass carp freeze-dried vaccine before stocking or when crossing the pond. (4) Disinfect with chlorine dioxide, dibromomarine bacteria, bromochloromarine bacteria or strong chlorine essence every half a month in the onset season. ⑤ Sprinkle rhubarb in the whole pool at the onset, with a water depth of 2kg per mu per meter (rhubarb is first decocted with appropriate amount of water 15min). ⑥. Every 100 kg of fish was fed with 0.5 kg of Chinese herbal medicines such as rhubarb, scutellaria baicalensis, phellodendron amurense and isatis root (used alone or in combination) and 0.5 kg of salt for 7 days. You can see Wang Xing's fish medicine.