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4罗非鱼疾病的防治4．1运动性气单胞菌病4．1．1病原病原为嗜水气单胞菌。此菌广泛存在于正常鱼肠道中和池塘水中,属于条件致病菌。它对正常的健康鱼难以感染,但是当鱼体受伤或养殖环境恶化使鱼体抗病能力降低时,该菌就可能乘机而入,使鱼感染发病。4．1．2症状与诊断
4 Prevention and treatment of tilapia diseases 4.1 Sports Aeromonas disease 4.1.1 Pathogenic pathogen Aeromonas hydrophila. This bacteria widely exist in the normal fish gut and pond water, are opportunistic pathogens. It is difficult to infect normal healthy fish, but when the fish is injured or the breeding environment is deteriorated so that the fish’s resistance to diseases is reduced, the bacteria may take the opportunity to make the fish infected. 4.1.2 Symptoms and Diagnosis