Distribution of leptocephali in the Kuroshio Current and East China Sea
Distribution of leptocephali in the Kuroshio Current and East China Sea
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DOI：
10.3354/meps235279
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发表时间：
2002-01-01
影响因子：
2.5
通讯作者：
Tsukamoto, K
中科院分区：
文献类型：
--
作者：
Miller, MJ;Otake, T;Tsukamoto, K
11月下旬和12月上旬，在黑潮和东海边缘的陆架断裂带和琉球群岛以南的北太平洋西部进行了首次抽样调查，使用大型中层浮游生物网收集leptocephali。结果表明，黑潮海域的鳗类渔获率和种类丰富度均高于西太平洋海域，黑潮海域的鳗类渔获率和种类丰富度高于西太平洋海域。最丰富的leptocephalis在该地区的鳗鱼扇-百合Congridae，Synaphobranchidae，蛇鳗科，Muraenidae和Nettastomatidae。几个分类群的congrid鳗鱼，包括Gnathophis nystromi nystromi和Ariosoma spp.，沿着黑潮的边缘产卵，还有muraenids，ophichthids，nettastomatids和Dysomma anguillare（Synaphobranchidae）。2个最丰富的种类，G. nystromi nystromi和D.在黑潮区中部的陆架断裂边缘附近产卵的是鳗类，但在台湾东北部的南部产卵的是有体鱼属和其他几种。这是第一次发现的鳗鱼产卵沿着一个陆架断裂附近的一个主要的西部边界流，在这个地区产卵将导致其leptocephali有可能被输送到广泛的地区的黑潮和对马暖流。
A first-of-its-kind sampling survey using a large midwater plankton net appropriate for collecting leptocephali was carried out in transects across the shelf break at the edge of the Kuroshio Current and East China Sea and in the western North Pacific Ocean south of the Ryukyu Islands during late November and early December. Leptocephali of at least 45 species of 10 families of anguilliform eels were collected, Catch rates and the species richness of leptocephali were higher in the Kuroshio region than in the western Pacific Ocean. The most abundant leptocephali in the region were of the eel fan-Lilies Congridae, Synaphobranchidae, Ophichthidae, Muraenidae and Nettastomatidae. Several taxa of congrid eels, including Gnathophis nystromi nystromi and Ariosoma spp., were spawning along the edge of the Kuroshio Current, as were muraenids, ophichthids, nettastomatids and Dysomma anguillare (Synaphobranchidae). The 2 most abundant species, G. nystromi nystromi and D. anguillare, appeared to be spawning near the edge of the shelf break in the central Kuroshio region, but the spawning of Ariosoma spp, and several other species was centered farther south to the northeast of Taiwan. This is the first discovery of the spawning of eels along a shelf break adjacent to a major western boundary current, and spawning in this region would result in their leptocephali having the potential for being transported to a wide range of areas by the Kuroshio and Tsushima Warm Currents.