Collection of spawning-condition eels of Ariosoma meeki in the Kuroshio Current in the East China Sea
Collection of spawning-condition eels of Ariosoma meeki in the Kuroshio Current in the East China Sea
复制标题
东海黑潮流产卵状态鳗鱼的采集
DOI：
10.1017/s002531541500209x
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发表时间：
2016
影响因子：
1.2
通讯作者：
Syuhei Nishida and Katsumi Tsukamoto
中科院分区：
文献类型：
--
作者：
Watanabe Shun;Seishi Hagihara;Michael J. Miller;Masamichi Machida;Kosei Komatsu;Syuhei Nishida and Katsumi Tsukamoto
尽管可以在大陆架栖息地捕捉到康氏鳗科、海鳗科和蛇鳗科等物种，但对海洋鳗鱼何时何地产卵知之甚少。康氏鳗属（Congrid genus Ariosoma）包括一些生活史尚不清楚的小型大陆架鳗鱼物种。2009年8月17日，在新月前后的东海黑潮西侧海面上，观察并捕获了成熟的米氏鳗雌、雄鳗，它们在海面上缓慢游动，表现出明显的生殖行为。观察到一条雄性和一条性别不明的鳗鱼（根据体型似乎是雄性）正在追逐一条较大的雌性，它们的头靠近雌性的泌尿生殖孔区域。用长柄浸网捕获的雌性（540 mm）和雄性（410 mm）的性腺处于生殖状态，因为在处理这两个标本的过程中释放了一些卵子或精液，雌性和雄性的性腺-体细胞指数（GSI）值分别为53和20。这是为数不多的观察到或收集到完全成熟的繁殖条件的海洋鳗鱼的案例之一，它提供了关于这种鳗鱼物种的产卵地点和时间的罕见信息。
When and where marine eels spawn is poorly known even though species such as those of the family Congridae, Muraenidae and Ophichthidae can be caught in continental shelf habitats. The congrid genus Ariosoma includes small continental shelf eel species whose life histories are not yet known. Mature male and female eels of Ariosoma meeki were observed and captured on 17 August 2009 at the surface at night in the western side of the Kuroshio Current in the East China Sea close to new moon, while they were swimming slowly at the surface and exhibiting apparent reproduction-related behaviour. One male and one sex-unidentified eel (seemingly a male based on body shape) were observed to be chasing one larger female with their heads located near her urogenital pore area. The gonads of the female (540 mm) and the male (410 mm) that were caught by a long-handled dip net were in reproductive condition, because some eggs or seminal fluid were released during handling of the two specimens and high gonad-somatic index (GSI) values of 53 in the female and 20 in the male were recorded. This is one of the few cases in which fully ripe reproductive-condition marine eels have been observed or collected and it provides rare information about the spawning location and timing of this eel species.