池塘水质中的亚硝酸盐含量高低是影响养殖品种生长和成活的关键因素之一。近几年,由于养殖结构的调整,池塘鱼虾混养模式得到了广泛应用,为促进鱼虾的生长,获得较高的产量和经济效益,养殖者多采取投喂高蛋白饲料(粗蛋白含量35%-38%),投喂高蛋白质饲料虽然加快了鱼虾的生长速度,但也带来了鱼虾排泄物对池塘底质和水环境污染加重的问题,一般在高温季节,特别是在养殖中后期池塘水质中亚硝酸盐含量增高,会造成鱼类 The level of nitrite in pond water quality is one of the key factors affecting the growth and survival of cultured species. In recent years, due to the adjustment of farming structure, pond fish polyculture pattern has been widely used in order to promote the growth of fish and shrimp, access to higher yields and economic benefits, farmers are more fed high protein feed (crude protein content 35% -38%). Although fed with high-protein feed has accelerated the growth of fish and shrimp, it also poses the problem of excrement of fish and shrimp exacerbating pollution of pond sediments and water environment. Generally, during the hot season, Aquaculture ponds in the late high levels of nitrite, can cause fish