First observations of the oceanic migration of Japanese eel, from pop-up archival transmitting tags
First observations of the oceanic migration of Japanese eel, from pop-up archival transmitting tags
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DOI：
10.3354/meps09266
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发表时间：
2011-01-01
影响因子：
2.5
通讯作者：
Tsukamoto, Katsumi
中科院分区：
文献类型：
--
作者：
Manabe, Ryotaro;Aoyama, Jun;Tsukamoto, Katsumi
首次利用弹出式档案传输(PAT)标签对日本鳗的产卵迁移进行了研究。三条带有PAT标签的银鳗(70到98厘米)于2008年1月被放生，6条于2008年11月在日本南部黑潮附近的两个不同地点放生。这些标签被预先编程为在发布后7至90天上升，并通过Argos卫星从除一个标签外的所有标签中检索到它们的弹出位置、鳗鱼游泳深度和水温的数据。大多数标签在黑潮洋流中或附近上升，距离鳗鱼的释放点最远1400公里，最长的39d跟踪周期表明鳗鱼向东移动。追踪约一个月或更长时间的两条鳗鱼表现出明显的海底垂直迁徙(DVM)，主要是在夜间约100-500米和白天500-800米之间游泳，最终一条鳗鱼游到1000米深。所有在深水中的鳗鱼在白天都达到了类似的最低温度范围，即使这个范围的深度发生了变化，这表明它们选择的是首选的最低温度，而不是特定的深度。计算出的直线游泳速度比之前报告中包括更大尺寸的鳗鱼的速度更快，这表明由于强流，沿着黑潮的游泳轨迹更快。日本鳗和其他鳗鱼可能会进行大规模的DVM，不仅是为了躲避捕食者，也可能是为了控制性腺成熟，方法是在夜间在水温较高的浅层游泳，然后在白天移动到水温较低的较深层。
Pop-up archival transmitting (PAT) tags were used for the first time to study the spawning migration of Japanese eels Anguilla japonica. Three silver eels (70 to 98 cm) tagged with PAT tags were released in January 2008 and 6 were released in November 2008 at 2 different locations near the Kuroshio Current, along the southern part of Japan. The tags were preprogrammed to ascend 7 to 90 d after release and data on their pop-up positions, eel swimming depths and water temperatures experienced were retrieved from all but one tag via Argos satellites. Most tags ascended in or near the Kuroshio Current up to 1400 km from the eels' release points, and the longest tracking period of 39 d suggested eastward movements of migrating eels. Two eels tracked for about a month or more showed clear diel vertical migrations (DVMs), predominantly swimming between depths of about 100 to 500 m at night and 500 to 800 m in the daytime, and eventually down to 1000 m depth for one eel. All eels over deep water reached similar minimum temperature ranges during the daytime, even if the depth of that range changed, suggesting they were selecting a preferred minimum temperature rather than a particular depth. Calculated straight-line swimming speeds were faster than those determined in previous reports that included larger-sized eels, suggesting swimming tracks along the Kuroshio Current were faster as a result of the strong current. Extensive DVMs may be performed by A. japonica and other anguillid eels not only for predator avoidance, but also possibly to control gonad maturation by swimming at shallower depths at night where water temperatures are warmer and then moving to deeper layers during the daytime where water temperatures are cooler.