Inshore migration of Japanese eel Anguilla japonica encouraged by active horizontal swimming during the glass eel stage
Inshore migration of Japanese eel Anguilla japonica encouraged by active horizontal swimming during the glass eel stage
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玻璃鳗阶段活跃的水平游泳促进了日本鳗鲡的近岸迁徙
DOI：
10.1111/fog.12637
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发表时间：
2023
影响因子：
2.6
通讯作者：
Kasai Akihide
中科院分区：
文献类型：
--
作者：
Karaki Tatsuro;Sakamoto Kei;Yamanaka Goro;Kimura Shingo;Kasai Akihide
日本鳗鲡（Anguilla japonica）的生物量通常取决于玻璃鳗向淡水栖息地的补充，但其近岸迁移的行为生物学仍然未知。借助海洋预测系统，我们阐明了一个招聘迁移的情况下，可以定量再现生物量在日本，这是以前估计的环境DNA采样方法的区域差异。为了使玻璃鳗成功地到达海岸，有必要将其在黑潮上的迁移行为变化纳入其中，例如较浅的深度偏好和向低盐度水域水平游泳。特别是，后者对于鼓励向濑户内海和日本北方太平洋一侧中部海岸（即，这表明玻璃鳗是一种活跃的淡水鱼类，它们会向靠近海岸的淡水游去。在玻璃鳗主要进行昼夜垂直迁移的次表层，有一个分叉路径连接黑潮和对马暖流的第二和第三分支，限制了玻璃鳗在日本主要内陆的日本海一侧的补充。模拟补充验证了eDNA作为一个代理指标估计的相对生物量在区域尺度上。模拟结果支持了玻璃鳗向近海迁移是由活跃的水平游动决定的。
The biomass of the Japanese eel (Anguilla japonica) is generally determined by the recruitment of glass eels into freshwater habitats, but the behavioral biology of their inshore migration remains unknown. With the aid of an ocean prediction system, we elucidated a recruitment migration scenario that can quantitatively reproduce a regional difference in biomass in Japan, which was previously estimated by an environmental DNA sampling method. For their successfully reaching shores, it is necessary to incorporate behavioral changes of glass eels within their migration on the Kuroshio Current, such as shallower depth preferences and horizontal swimming toward lower salinity water. In particular, the latter is essential for encouraging recruitment into both the Seto Inland Sea, with a relatively high ratio (20%–30%) of the total recruitment to Japan and the coasts in the central part of the Pacific side of northern Japan (i.e., the northern limit of the habitable distribution), manifesting that glass eels actively swim toward freshwater near coastal regions. In the subsurface layer, where glass eels mainly conduct diel vertical migration, there is a bifurcation path connecting the Kuroshio Current to the second and third branches of the Tsushima Warm Current, restricting the recruitment of glass eels into the Sea of Japan side of the main inland in Japan. The simulated recruitment validated that the eDNA acts as a proxy indicator for estimating the relative biomass on the regional scale. The simulation supported that the inshore migration of glass eels is determined by active horizontal swimming.