Relative contribution of migratory type on the reproduction of migrating silver eels, Anguilla japonica, collected off Shikoku Island, Japan
Relative contribution of migratory type on the reproduction of migrating silver eels, Anguilla japonica, collected off Shikoku Island, Japan
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DOI：
10.1007/s00227-008-1116-7
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发表时间：
2009-03-01
期刊：
影响因子：
2.4
通讯作者：
Arai, Takaomi
中科院分区：
文献类型：
--
作者：
Chino, Naoko;Arai, Takaomi
为了了解日本鳗不同迁徙类型对繁殖的贡献，在产卵迁徙季节，用X射线电子探针分析了37条银鳗的耳石锶(Sr)和钙(Ca)含量。耳石锶/钙比值的较大范围表明，日本鳗在其作为玻璃鳗补充到沿海地区后的生长阶段，在淡水、微咸水和海水中的栖息地利用不是强制性的，而是兼性的。发现了河鳗、河口鳗和海鳗三种迁徙类型。以河口鳗为主(59%)，其次是海鳗(22%)和河鳗(19%)。产卵迁徙季节的河鳗比例较低，这表明栖息在附近沿海地区的河口和海鳗可能对该地区的下一代有较大的繁殖贡献。
In order to understand the reproductive contribution among migratory types in the Japanese eel, Anguilla japonica, otolith strontium (Sr) and calcium (Ca) concentrations by X-ray electron microprobe analysis were examined for 37 silver eels collected in Kii Channel off Shikoku Island during the spawning migration season. The wide range of otolith Sr:Ca ratios indicated that the habitat use of A. japonica was not obligatory but facultative among fresh, brackish and marine waters during their growth phases after recruitment to the coastal areas as glass eels. Three migratory types, which were categorized as river eels, estuarine eels and sea eels were found. The estuarine eels were dominant (59%), followed by sea eels (22%) and river eels (19%). The low proportion of river eels from the spawning migration season suggested that the estuarine and sea eels inhabiting the nearby coastal areas might make a larger reproductive contribution to the next generation in this area.