陈世冲,张庆荣,和Yu-SanHan(2018)日本鳗鱼的产卵迁徙,安圭拉,沿马里亚纳山脊西部被认为是最长的动物迁徙之一。为该物种制定适当的保护政策,需要完整的生命周期研究,但是鳗鱼的迁徙路线记录仍然很少。安圭拉,A.marmorata,双色鳗鱼是台湾的三种常见鳗鱼。本研究使用弹出式档案传输标签来跟踪它们在迁移的海洋阶段的运动。二十条银鳗鱼(养殖和野生)在桂山和六超群岛附近被标记并释放。龟山岛群中的所有三个物种都被夹带在黑潮中,弹出标签数据显示,23天后,最远的距离约为1500公里,到屋久岛的南部水域,日本。相比之下,在六超岛附近释放的鳗鱼向相反的方向移动,这表明它们受到台湾西南水域再循环的影响。鳗鱼的迁移速度估计在12.9km/d至65.2km/d之间。几种鳗鱼表现出diel垂直迁移行为,白天进入更深的水域,晚上进入较浅的水域。养殖鳗鱼表现出与野生鳗鱼相似的diel垂直迁移模式。这项研究的结果表明,台湾鳗鱼在早期迁徙期间会穿越黑潮,不论物种和来源。重要的是,人工释放后,养殖鳗鱼的行为似乎与野生鳗鱼相似。此信息为释放养殖鳗鱼进行资源富集计划提供了重要的理由。
Shih-Chong Chen, Ching-Rong Chang, and Yu-San Han (2018) The spawning migration of the Japanese eel, Anguilla japonica, along the western Mariana Ridge is considered one of the longest animal migrations. To establish an appropriate conservation policy for this species, a complete life cycle study is required, but the migratory routes of anguillid eels remain poorly documented. Anguilla japonica, A. marmorata, and A. bicolor pacifica are three common eel species in Taiwan. The present study used pop-up archival transmitting tags to track their movements during the oceanic phase of their migration. Twenty silver eels (farmed and wild) were tagged and released near the Gueishan and Liuchiu Islands. All three species in the Gueishan Island group were entrained in the Kuroshio Current, and pop-up tag data showed that, after 23 days, the farthest distance travelled was approximately 1,500 km, to the southern waters of Yakushima, Japan. In comparison, eels released near Liuchiu Island moved in the opposite direction, which suggests that they were influenced by the recirculation in the southwestern waters of Taiwan. The migration speed of eels was estimated to be between 12.9 km/d and 65.2 km/d. Several eels exhibited diel vertical migration behavior, moving into deeper water during the daytime and ascending into shallower waters at night. The farmed eels exhibited similar patterns of diel vertical migration to wild eels. The results of this study suggest that eels from Taiwan travel through the Kuroshio Current during their early migration, irrespective of species and source. Of importance, farmed eels appeared to behave similar to wild ones following artificial release. This information provides important rationale for releasing cultivated eels for resource enrichment programs.