Cause: The cause is unknown and may be caused by a virus. Illness: Some patients have neck enlargement and organ bleeding; some have bleeding spots on the plastron, and mouth and nose bleeding can also be seen at the late onset. There are two characteristics of the disease: First, neck swelling, but not redness; Second, there is a solidified blood clot in the gastrointestinal tract or no blood. When I was dying, my neck stretched out. Prevention: 1) Because of unknown causes, there is still lack of effective treatment and prevention. Often fed "Nongfu 3 type" for 1 to 2 days, once or twice a month; 2) Tangshui is regularly disinfected with "Fish Extinguishment", "Mixed Detox" or "Glycotricarb Disinfectant" Quanchiposa in a regular manner. The bait is regularly supplemented with "Strong Gram 103", and each 500 kg of fish is administered one at a time. Coupling with 3 to 7 days, can enhance immunity; 3)Discover the diseased fish and fish it out in isolation. At the same time, disinfect the whole pool with the "fish killer", "killer spirit" or "fish fungus clear disinfectant" in the disease pool; 4) In the non-pathogenic pool, change the water after soaking in formalin 100 ppm and dipping in the pond. Sprinkle the whole fish with the "fish bacterium clear disinfectant" and feed it at the same time with "Yi Bi Kang" or "Qianke 99". Use for 3 to 5 days, 2 to 3 times per month. First Aid Box,Baby First Aid Kit,First Aid Kit Box,Basic First Aid Kit Dongguan City Risen Medical Products Co., Ltd. , https://www.risenppe.com