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

1999年在岩手县大土海岸，利用显微数据记录仪对2条沿海岸迁徙的大麻哈鱼进行了连续2天的体轴、尾拍活动等连续观测，这在以往的研究中是不成功的。对这些数据的分析表明，鲑鱼上升消耗的能量大于下降，并且从不控制气囊中的空气量。我们还成功地获得了2000年7月从离岸迁移的鲑鱼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身上安装了微型数据记录器，并在北海道的根室市海岸恢复。初步分析显示，鲑鱼的平均游速为36.2公里/天。1999年和2000年在中禅寺湖对30尾虹鳟（Oncorhynchusnerka）进行了数据记录实验，成功地获得了23尾虹鳟的游泳深度和环境温度数据。从实验中，我们预期的行为和温度生理差异，在他们的性能之间的条件下的性腺的两种性别。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.