Prevention of fulminant hemorrhagic disease of fish in autumn

Fish are easy to suffer from fulminant hemorrhagic disease in autumn. the disease has the advantages of acute onset, rapid transmission, long epidemic time, high mortality and great loss. Once the disease is difficult to control and the disease is easy to repeat, households should enhance their awareness of prevention and prevent the occurrence of the disease.

1. Fish species must be disinfected with 1% to 2% salt water before entering the pond, and the bath time depends on the physique and temperature of the fish. When conditions permit, the fish species can be soaked with fulminant hemorrhagic disease vaccine.

Second, timely change of water and increase oxygen should keep the water quality fresh and change water frequently. If the condition is limited, it is inconvenient to change water, the whole pool can be sprinkled with raw lime slurry, and the aerator should be used reasonably at the same time.

3. Regular water disinfection and oral drug prophylaxis can alternately disinfect the water body with environmentally friendly drugs such as dibromohydantoin and bromochloroling every 10 to 15 days, and then use beneficial microbial preparations to improve water quality every 5 days after disinfection. In the feed mixed with appropriate amount of berberine hydrochloride, aquatic special erythromycin and other safety drugs, 5 days as a course of treatment, 1 to 2 courses of treatment per month.

Fourth, reasonable close culture and mixed culture when the culture density is too high, it is necessary to catch and sparse culture in batches, maintain a reasonable culture density in the pond, and try not to let the water environment bear overloaded fish stocks.

Fifth, choose medium and high-grade feed, and reduce the use of feed raw materials (raw bran, corn, @ # @ 245mm, etc.) and low-grade feed.

6. Pay attention to pond hygiene. Usually, weeds should be removed frequently and food grounds should be cleaned. No residual bait should be left. Dead fish should be fished out in time and carried out pollution-free treatment.