Salmon migaration and their behavioral and physiological adaptation to fluctuation of ambient temperature

利用以往从未成功获得过的微型数据记录仪，我们可以获得1999年岩手县大土沿岸迁徙的两条鲑鱼连续两天的游泳体轴线、尾拍活动数据。对这些数据的分析表明，鲑鱼在上升过程中消耗的能量大于下降过程中消耗的能量，并且从不控制气囊中的风量。2000年7月，我们成功地获得了一条近海迁徙的鲑鱼51天的游泳速度、游泳深度和环境温度的连续数据。我们在白令海中南部的一条鲑鱼上安装了一个微型数据记录器，并在北海道根村市的海岸发现了这条鱼。初步分析表明，鲑鱼的平均游泳速度为36.2公里/天。这意味着51天总共有2427公里的游泳距离，占从放流点到收获点的总水平距离2760公里的80%。1999年和2000年，我们在楚岑集湖对30条鲑鱼进行了数据记录仪实验，成功地获得了23条鱼的游泳深度和环境温度数据。通过实验，我们期望两性性腺状况在行为和温度-生理方面的表现有所不同。数据正在分析中。

We could obtain continuous data of swimming body axis, tail beat activity for two days from two coastal-migrating chum salmon in Otsuchi coast, Iwate in 1999 using micro-data loggers, which have never been successfully obtained in the past. Analysis of these data showed that salmon consumed more energy for ascent than descent and never control the air volume in the air bladder.We also succeeded to obtain 51days continuous data of swim speed, swim depth and ambient temperature from a offshore-migrating chum salmon in July, 2000. We attached a micro-data logger to a salmon at mid south of Bering Sea and recovered at coast of Nemuro city of Hokkaido. Preliminary analysis suggested that salmon swam at a mean speed of 36.2km/day. This means 2427km of swim distance in total during 51days, which occupied 80% of total 2760km of horizontal distance from release point to recaptured point.We also conducted data-logger experiment on 30 trout, Oncorhynchus nerka, at Chuzenji Lake in 1999 and 2000 and successfully obtained data of swim depth and ambient temperature from 23 fish. From experiments we expected behavioral and temperature-physiological difference in their performance between condition of gonads of both sex. Data are under analysis.