固定化微藻对养殖对虾细菌数量的影响

以固定化技术为基础,人工制成微藻藻珠,引入波吉卵囊藻(Oocystisborgeisnow)和微绿球藻(Nannochloropsis oculata)于凡纳对虾(Litopenaeusvannamei)养殖环境中,采用直接计数法研究了养殖水体、对虾肌肉、对虾肝胰脏中异养菌及弧菌的数量变化。结果表明,引入藻珠能抑制异养菌和弧菌的生长,并能改善水质。试验末期,试验1、2、3组水样中弧菌数量分别降低了95%、95%、81.7%,异养菌数量降低了72.3%、77.1%、95.6%。可见固定化微藻在一定程度上能改善虾池细菌生态系,有助于预防对虾疾病。

Influence of immobilized microalgaes on the quantity of bacteria of shrimp

With the immobilization for alginate beads ,Oocystis borgei snaow and Nannocgloris oculata were introduced into the cultural environment of shrimp,Litopenaeus vannamei.Numberical dynamics of heterotrophic bacteria and Vibrio in the water, muscle and hepatopancreaty of shrimp were inspected by direct counting.The results show that these two microalage alginate beads can inhibit growth of heterotrophic bacteria and Vibrio.At last,compared to constrol group, the number of Vibrio in water of tested group1,2,3 declined 95%,95%,81.7% when the number of hepatopancreas declined 72.3%,77.1%,95.6%,respectively.Meanwhile, concentration of NH_3-N and NO_2-N of control group were 60.8%,81.4%,7.1% higher than tested group1,2 and 3 respectively. Furthermore, the number of microalage beads can be adjusted to keep balance of the water system . Using microalage alginate beads ecology is an important measure to inhibit growth of heterotrophic bacteria and Vibrio and to adjust water quality for preventing the shrimp disease.