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The effect of ultrasonic wave on the growth of Pseudobagrus vachelli

FANG Jin1,QIAN Wei-guo1,LI Wei-chun2,ZHOU Ying-qi1(1.College of Marine Science & Technology,Shanghai Fisheries University,Shanghai 200090,China;2.College of Aqua-life Science & Technology,Shanghai Fisheries University,Shanghai 200090,China)  
This is an exploring experiment using ultrasonic wave in aquaculture to find out their effects on fishes.The experiment fish,Pseudobagrus vachelli,were selected with an average body length 8.76±0.42 cm.The experiment has been organized as 4 experimental groups and 1 control group,which were treated by a set of stimulation,i.e.4 groups of ultrasonic pulses in varied pattern.The results show a significant difference(P0.01) between groups after 60 days' ultrasonic wave radiation.The group A,treated by 23 KHz wave in 400 mW/cm2 with 3 minutes radiation duration,has the fastest growth rate,19% faster than the control group in weight.Their average body length is 4% longer than the control group too.The growth rates of the body length and weight of the group A are 39.4% and 187.2% respectively.This experiment preliminary shows that low intensity of the ultrasonic wave has a positive impact on the growth of Pseudobagrus vachelli.The biological study and observation has been carried out in all sampling phases.
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