作　　者： ; ; ; ; ; ; ; ;

机构地区： 中国水产科学研究院珠江水产研究所

出　　处： 《水产学报》 2013年第8期1220-1228,共9页

摘　　要： 为了研究草鱼池生物絮团形成所需的适合C/N,实验分析不同C/N水平对水泥池中生物絮团的形成、水质及草鱼生长的影响。对照组投喂基础饲料(C/N为10.8∶1),实验组在基础饲料上添加葡萄糖,控制C/N分别为15∶1、20∶1和25∶1。结果显示,当C/N≥15时,形成的生物絮团可以有效的调节水质,降低水体中的氨氮、亚硝酸盐氮水平;各组的生物絮团体积指数(FVI)随养殖时间逐步增加,在第14天趋于稳定;随着C/N增高,尽管实验组水体中形成的生物絮团粗蛋白含量显著高于对照组(P<0.05),但是草鱼生长却呈下降趋势。综合而言,生物絮团技术应用于草鱼养殖适宜的C/N为15,该比值能促进生物絮团的形成,并能有效降低水中的氨氮、亚硝酸盐氮水平。 Biofloc technology （BFT）was recently proposed as a new approach towards more sustainable practices that lower environmental impacts and prevent diseases incidence. In order to explore required adaptive C/N of bioflocs formation, the effects of C/N on bioflocs formation, water quality and growth performance of grass carp in zero-water exchange tanks were investigated. A locally formulated and prepared feed containing 30% crude protein with C/N ratio 10.8 was applied to all ponds. In order to raise the C/N ratio of the feed input to 15,20 and 25, glucose was applied separately as a source of carbohydrate in addition to artificial feed. The results showed that when the C/N was over 15 ,the bioflocs could effectively regulate water quality, reduce ammonia and nitrite concentration; the bioflocs volume index （FVI） was increasing with gradual increase in breeding time and stabilized on 14 d in each group; With the C/N increased ,the crude protein content of bioflocs groups was significantly higher（ P 〈 0.05 ）than that of control groups,but there was a decreasing trend in the growth of grass carp. Overall, when C/N was 15 in the biofloc technology used in the breeding of grass carp, this ratio could effectively promote the bioflocs formation and reduce ammonia nitrogen and nitrite nitrogen levels.

关 键 词： 草鱼 生物絮团 碳氮比 水质

领　　域： [农业科学] [农业科学]