摄食声对草鱼幼鱼的诱集作用

THE ATTRACTIVE EFFECT OF FEEDING SOUND TO JUVENILE GRASS CARP CTENOPHARYNGODON IDELLUS

以草鱼(Ctenopharyngodon idellus)幼鱼为实验对象,进行了声音播放实验,旨在探究草鱼幼鱼对水下录制的草鱼摄食浮萍声音(简称摄食声)的行为反应。以不播放声音的草鱼鱼群作为对照,探讨了4种单频音(500、1000、2000和3000 Hz)和摄食声对草鱼游泳行为和在水槽内的分布的影响。结果表明:在播放单频音时,3min内草鱼的趋音游泳速度和逗留时间与对照组无显著性差异(P>0.05);在播放摄食声时,3min内草鱼的趋音游泳速度和逗留时间显著高于4种单频音组和对照组(P<0.05);在播放单频音时,20min内草鱼的平均游泳速度、水槽内的分布和趋音率与对照组无显著性差异(P>0.05);在播放摄食声时,20min内草鱼的平均游泳速度和趋音率都显著高于4种单频音组和对照组(P<0.05)。草鱼摄食声对草鱼幼鱼有诱集作用,为声音诱鱼技术研究提供了科学依据。

To assess the effect of feeding sound on behaviors of juvenile grass carp(Ctenopharyngodon idellus),the recorded underwater feeding sounds of natural food Lemna minor by 10—15 cm body length grass carps were played back to the experimental fish in phonotaxis experiments.The fish swimming behaviors and distributions in the experimental tank after exposures to different sounds(pure tones 500—3000 Hz and the feeding)were investigated in a fibreglass tank using no sound playing as a control.The results showed that the fish exposed to the feeding sound had the highest swimming speed towards the sound source after 3 minutes and the longest sojourn time in region 4&5 closest to the sound source,while the fish exposed to the pure tone had same swimming speed towards the sound source and same sojourn time in region 4&5 as the control.In the 20 minutes of playbacks,the fish exposed to the feeding sound had the highest average swimming speed and the longest time of distribution in region 4&5,compared with the control and the fish exposed to the pure tones.Our results indicated that feeding sounds had attracting effect on juvenile grass carps.These findings provide scientific basis for acoustic attracting fish.