一、病原暴发性流行病在不同鱼类,其致病病原体有一定的差异,主要是由嗜水气单胞菌、温和气单胞菌、弧菌、鲁克氏耶尔森氏菌等细菌感染引起。这类病原中许多是条件致病菌,池塘环境好,鱼体抵抗力强时,病原菌虽存在水体中但不会引起鱼病,池塘水质恶化、鱼体抵抗力差时,易引起鱼病 First, the pathogenic outbreak of epidemics in different fish, the pathogenic pathogens have some differences, mainly by Aeromonas hydrophila, Aeromonas sobria, Vibrio, Yersinia bacteria such as bacteria Infection caused. Many of these pathogens are opportunistic pathogens, the pond environment is good, the fish body resistance is strong, the pathogen exists in the water but does not cause fish disease, pond water quality deterioration, poor fish resistance, easy to cause fish disease