Japanese eel Anguilla japonica do not assimilate nutrition during the oceanic spawning migration: evidence from stable isotope analysis
Japanese eel Anguilla japonica do not assimilate nutrition during the oceanic spawning migration: evidence from stable isotope analysis
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DOI：
10.3354/meps08448
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发表时间：
2010-01-01
影响因子：
2.5
通讯作者：
Mochioka, Noritaka
中科院分区：
文献类型：
--
作者：
Chow, Seinen;Kurogi, Hiroaki;Mochioka, Noritaka
2008年至2009年期间，在西马里亚纳海岭南部捕获了12条成年日本鳗鱼，这是推测的产卵区。我们比较了‘Mariana Silver’(末期)和日本江河、湖泊和沿海地区捕获的黄鳗和银鳗(初期)的稳定碳、氮同位素比值(增量C-13和增量N-15)。初始阶段和结束阶段之间的稳定同位素特征曲线是相似的；两者的特征是，增量C-13(初始阶段和结束阶段分别为-24.9-12.0‰和-20.5--11.3‰)和Delta N-15(分别为6.5-18.4‰和9.0-18.1‰)具有很大的范围。中上层鱼类，包括在西马里亚纳海脊附近捕捞的其他几种鳗鱼，其特征是C-13增量的范围非常窄(-16.9-15.3‰)，而N-15增量的范围很宽但比日本鳗鱼低(5.3-11.1‰)。与马里亚纳中上层鱼类不同，鳗鱼在产卵初期和末期的稳定同位素特征非常相似，这表明在长时间(约6mo)的产卵迁移过程中，日本鳗鱼不会从海洋环境中吸收营养，并保持其停止摄食地点的初始同位素值。
During 2008 and 2009, a total of 12 adult Japanese eels Anguilla japonica were captured in the southern part of the West Mariana Ridge, the presumed spawning area. We compared the stable carbon and nitrogen isotope ratios (delta C-13 and delta N-15) between the 'Mariana silvers' (terminal phase) and those of yellow and silver eels caught in rivers, lakes and coastal areas of Japan (initial phase). Profiles of stable isotope signatures between the initial and terminal phases were similar; both characteristically had a wide range for delta C-13 (-24.9 to -12.0 parts per thousand and -20.5 to -11.3 parts per thousand for the initial and terminal phases, respectively) and delta N-15 (6.5 to 18.4 parts per thousand and 9.0 to 18.1 parts per thousand, respectively). Mesopelagic fishes, including several other anguillid species caught near the West Mariana Ridge, characteristically had a very narrow range of delta C-13 (-16.9 to -15.3 parts per thousand) and a wide but lower range of delta N-15 (5.3 to 11.1 parts per thousand) than the Japanese eels. The very similar profiles in stable isotopic signatures between the initial and terminal phase eels, distinct from those of Mariana mesopelagic fishes, indicate that Japanese eels do not assimilate nutrition from the marine environment during long (ca. 6 mo) spawning migration and retain the initial isotopic values of where they ceased feeding.