近两年笔者在秋冬季节和春初进行养殖技术服务时，发现NO类中毒在我市养殖户鱼池中屡有发生，现将其有关情况介绍如下，供参考。病因与病原：由NO浓度过高而引起。当NO在水体中的浓度在0.15mg／L以下时，对鱼体不会造成任何危害，但当NO浓度在1mg／L以上时，就会对鱼类产生极大 The past two years, the author in the autumn and winter seasons and early spring breeding technology services, found that NO poisoning in our city farmer fish ponds have occurred frequently, the relevant circumstances are as follows, for reference. Etiology and pathogens: caused by excessive NO concentrations. When the concentration of NO in water is less than 0.15mg / L, it will not cause any harm to the fish, but when the concentration of NO is above 1mg / L, fish will be extremely large