生物絮团在凡纳滨对虾封闭养殖试验中的形成条件及作用效果

Conditions for bio-floc formation and its effects in closed culture system of Litopenaeus vannamei

本研究尝试将生物絮团技术应用到凡纳滨对虾试验性封闭养殖系统中,筛选生物絮团养殖所需的适宜碳源及其添加量,在此基础上研究生物絮团养殖系统中凡纳滨对虾的适宜养殖密度。结果表明,在养殖密度为150和300尾/m2的凡纳滨对虾养殖系统中,每天按照饲料(蛋白含量42%)投喂量的77%添加蔗糖,生物絮团4d即可形成,在84d的养殖期内,养殖水体的氨氮和亚硝酸氮浓度均维持在较低水平,对虾成活率在80%以上,取得较好的养殖收获。

Bio-floc technology was applied in closed culture system of Litopenaeus vannamei. The optimum carbon source and its addition for bio-floc culture was screened, and the optimum carbon addition and stocking density of L. vannamei was determined. Results showed that in closed culture system of L. vannamei at the stocking density of 150 and 300 PL/m2, sucrose was added in the quantity of 77% feed （containing 42% protein） everyday, bio-floc formed on the 4th day post stocking. During the 84 d culture period, the ammonia-N and nitrite-N concentrations kept at very low levels, and the shrimp survival rate was above 80%, which means better harvest of L. vannamei in bio-floc culture system.