Larval Japanese eel (Anguilla japonica) as sub-surface current bio-tracers on the East Asia continental shelf

文献类型： 外文期刊

第一作者： Han, Yu-San

作者： Han, Yu-San;Han, Yu-San;Zhang, Heng;Tseng, Yu-Heng;Shen, Mao-Lin

作者机构：

关键词： annual catch;dispersal;Kuroshio;leptocephali;Taiwan Strait

期刊名称：FISHERIES OCEANOGRAPHY （ 影响因子：2.786； 五年影响因子：2.823 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Larval Japanese eel (leptocephali) are passively transported from their spawning sites of the North Equatorial Current to the Kuroshio and its branch waters for 46 months before reaching the East Asian coasts. The larvae mainly stay within water depths between 50150 m. The dispersal dynamics of larvae thus should reflect the sub-surface oceanic currents on the East Asia continental shelf. An analysis of Japanese glass eel catch data in East Asian countries during 1985 to 2009, and for Taiwan from 1968 to 2008, indicates that the overall annual catch is generally correlated across countries of East Asia, and between north and west areas of Taiwan. The Kuroshio and its branch waters disperse glass eels throughout East Asian habitats, and the glass eel distribution matches the flow directionality of oceanic currents. Recruitment in western Taiwan occurs with a sequential southwestern to northwestern direction, suggesting that the Taiwan Strait Current penetrates the western coast of Taiwan in the sub-surface layer in winter. The monthly averaged sub-surface 50 m circulation pattern in the vicinity of Taiwan and modeled tracer experiments also support the northward winter sub-surface current in Taiwan Strait. These results suggest that the larval Japanese eel could serve as a valuable bio-tracer of sub-surface currents, and the earlier recruitment dynamics of Japanese glass eels in Taiwan could be a good predictor for the subsequent catch in other East Asia areas.

分类号： S9

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