论文部分内容阅读
鱼病的发生受很多因素的影响,危害我国水产养殖业的大多数病原菌为条件致病菌,当水温升高至28℃左右,有机质浓度增加时,亚硝酸盐含量增加,条件致病菌被激活,迅速大量繁殖并产生毒素等致病因子。在池中高密度饲养的鱼类频繁遭受亚硝酸盐的刺激,导致免疫力下降,对各种传染病的易感性增加,所以控制亚硝酸盐可有效地预防鱼病的发生。
The occurrence of fish diseases is affected by many factors, most of the pathogenic bacteria that endanger aquaculture in our country are opportunistic pathogens. When the water temperature rises to about 28 ℃, the content of nitrite increases when the organic matter concentration increases. Is activated, quickly multiply and produce toxins and other pathogenic factors. High-density fish kept in the pool are subject to frequent nitrite stimulation, leading to decreased immunity and increased susceptibility to various infectious diseases. Therefore, the control of nitrite can effectively prevent the occurrence of fish diseases.