Evaluation of the responses to the photoelectrochemical stimuli on the swimming behavior of Aurelia aurita and its application for their ecological control

了解水母（Aureria aurita）的生物学，特别是对其游泳行为的了解，将为我们解决水母堵塞电厂和船舶取水管道的问题，以及减少渔业的麻烦提供关键。为了做到这一点，研究人员研究了水母的游泳是否受到中等或更弱的刺激，如光、声和电，以连续或调制的方式控制。1)在实验室水箱中，利用激光或超声波散射和图形图像定位对水母的游动行为进行了跟踪。通过追踪水母在恒电位器供电或LED、激光和荧光灯照明的刺激下的运动，没有看到任何特定的影响，在使用的刺激水平下，它们的平均游泳行为。2)通过视频图像分析，对脉动和游动水母的横截面进行了长达10分钟的时间序列评估。横切面图像的形状和面积随时间的变化表明，该监测方法对于分析水母在姿态和脉动速率上对各种刺激的瞬态响应是非常有用的。(3)给定时间段内的平均脉动率随光照变化呈负变化，这可能与所施加刺激的适应性有关。通过对视频图像的分析，研究了水母脉动速率的瞬态变化。虽然样品之间存在着个性，但在照明开启或关闭后的速率变化显示在几十秒内恢复，这解释了基于长时间计数的平均脉动速率的负变化。

Understandings of the biology and especially of the swimming behavior of the jellyfish, Aureria aurita, will bring us keys to solve the problems with jellyfish stopping the water intake pipes at power plants and ships, and also to reduce the troubles in fisheries. In order to do this, it was studied whether the swimming of jellyfish is controlled with moderate or even weaker stimuli such as light, sound and electricity either in continuous or in modulated manners.1) In the laboratory water tank the swimming behavior of jellyfish were traced by using the scatterings of laser light or ultrasound and also by the graphical image positioning. From the tracing after the locomotion of jellies upon stimulation by the electricity supplied with a potentiostat or light illumination with LED, laser and fluorescent light, any specific influence was not seen on their averaged swimming behaviors with the stimulation levels employed.2) With the video image analysis, the cross section of the pulsating and swimming jellyfish were evaluated in time series for up to several 10 minutes. The changes in the shape and the area of the cross-sectional image as a function of time showed that this monitoring method is quite useful to analyze the transient response of medusae in the attitude and pulsating rate upon a variety of stimuli.3) The averaged pulsation rate for a given period of time showed negative change upon the light illumination possibly due to the adaptability to the stimulus applied. With the video image analysis the transient change in the pulsation rate of jellyfish was examined. Although there are individuality among samples the rate change after ON or OFF of illumination was shown to recover in several ten seconds which explains the negative change in the averaged pulsation rate based on the prolonged counting of them.