青鱼出血病是危害青色最严重的疾病之一,尤以二龄为甚。通过人工注射免疫后,可使青鱼的成活率由原来20％左右提高至60—90％,个别的可达98.98％。通过病鱼肾脏组织超薄切片电镜观察,首次发现病毒颗粒(直径为50—56毫微米)的存在,经0.15微米孔径的滤膜过滤的病原悬液可反复在鱼体内传3—4代,使健康鱼发病。因此,认为青鱼出血病是病毒引起的疾病。 Herring hemorrhagic disease is one of the most serious diseases that endanger cyanosis, especially in the second age. After being injected by artificial injection, the survival rate of herring can be increased from about 20% to 60-90% and the individuality can reach 98.98%. Through the observation of the ultrastructure of the diseased fish kidney tissue by ultrathin section electron microscopy, the virus particles (diameter of 50-56nm) were found for the first time. The pathogen suspension filtrated by the membrane filter with the aperture of 0.15μm can be repeatedly transmitted 3-4 generations in the fish, Health fish disease. Therefore, herring bleeding is considered a disease caused by the virus.