Prevention Methods and Technical Key Points for Fulminant Hemorrhagic Disease in Fish

Main measures to prevent fulminant hemorrhagic disease in fish:

1. Strengthen awareness of prevention. This disease has a sudden onset, spreads quickly, has a long epidemic season, and causes high mortality and heavy losses. Once an outbreak occurs, it is difficult to control, and the condition tends to recur.

2. Before fry and fingerlings are stocked into ponds, they must be disinfected by soaking in 1%-2% salt water. The soaking time depends on the fish's physique and the temperature. When conditions permit, fish fingerlings can be soaked with fulminant hemorrhagic disease vaccine.

3. Change water and increase oxygen in a timely manner. Keep the water quality fresh and change the water frequently. If water changing is inconvenient due to limited conditions, quicklime can be slaked into a slurry and splashed over the entire pond, and aerators should also be used reasonably.

4. Regularly disinfect the water body and use oral medications for prevention. Every 10-15 days, environmentally friendly drugs such as dibromohydantoin and bromochloro hydantoin can be used alternately to disinfect the water body. Five days after disinfection, beneficial microbial preparations can be used to improve water quality. Mix appropriate amounts of safe drugs such as berberine hydrochloride and erythromycin specially for aquaculture into the feed, with 5 days as one treatment course, feeding 1-2 treatment courses per month.

5. Carry out rational dense stocking and polyculture. Try not to let the water environment carry an excessive fish load.