本文介绍了鱼类消化道菌群对鱼类的营养作用、免疫作用，对病原菌入侵的拮抗作用和自身的致病作用；
This paper showed the effect of microflora in fish digestive tract on fish nutrition, immunity, antagonistic effect for pathogenic microbes inbreaking and disease-causing in itself.
本文综述了微量元素间及其与营养素之间的协同与拮抗作用，矿物元素发生协同与拮抗作用的机理。
The paper summarized the cooperation and antagonism between trace elements and nutrients, and the mechanism of the cooperation and antagonism happened by mineral elements.
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