【摘要】 为了探讨噬菌蛭弧菌制剂净化水质和病害防治的效果,试验以0.75 mL/m2的用量向乌鳢养殖池泼洒浓度为1.0×108pfu/mL的噬菌蛭弧菌制剂,观察7 d内养殖池的pH、DO、NH3-N、NO2--N含量及弧菌总数等主要水质指标以及乌鳢死亡数目的变化。向乌鳢养殖池加入噬菌蛭弧菌后,试验组与对照组相比,NH3-N、NO2--N含量及弧菌总数明显减少(p<0.05),DO明显增大(p<0.05),但pH变化不明显(p>0.05);乌鳢死亡率也明显减少(p<0.05)。试验结果表明,以0.75 mL/m2的用量向乌鳢养殖池泼洒浓度1.0×108pfu/mL的噬菌蛭弧菌制剂,有利于提高DO含量及乌鳢存活率,降低NH3-N、NO2--N含量及弧菌总数。更多还原

【Abstract】 The experiment aimed to study the effect of Bdellovibrio bacteriovorus on water quality of farming pond and fish disease control,a concentration of 1.0×108 pfu/mL Bdellovibrio bacteriovorus was poured into the snakehead(Ophiocephalus argus) farming pond with the usage of 0.75 mL/m2,and the changes(△) of the water quality parameter such as DO content,NH3-N content,NO2——N content,Vibrio population and the death numbers of snakehead were studied within 7 days.It was demonstrated that,in contrast with the control group,△(NH3-N),△(NO2——N) and △(Vibrio population) in the experiment group were dramatically lowered(p<0.05),and △(DO) was dramatically increased(p<0.05),but the change of pH was not obvious(p>0.05).Furthermore,the average △(death numbers) of snakehead was also reduced(p<0.05).The experiment results indicated that the use of 1.0×108 pfu/mL Bdellovibrio bacteriovorus with the usage of 0.75 mL/m2 helped to increase the DO content of farming pond and survival rate of snakehead, and also helped to accelerate the reduction of the content of NH3-N,NO2——N and Vibrio population in the farming pond.更多还原