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Migratory history of wild and released ayu (Plecoglossus altivelis) in the Kurobe River, Japan
https://doi.org/10.15083/00040733
https://doi.org/10.15083/00040733b3875773-6394-4f11-b12b-d0b18f904069
名前 / ファイル | ライセンス | アクション |
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2007-04-05 | |||||
タイトル | ||||||
タイトル | Migratory history of wild and released ayu (Plecoglossus altivelis) in the Kurobe River, Japan | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題 | ayu | |||||
主題Scheme | Other | |||||
キーワード | ||||||
主題 | Plecoglossus altivelis | |||||
主題Scheme | Other | |||||
キーワード | ||||||
主題 | migratory history | |||||
主題Scheme | Other | |||||
キーワード | ||||||
主題 | otolith | |||||
主題Scheme | Other | |||||
キーワード | ||||||
主題 | Sr: Ca ratios | |||||
主題Scheme | Other | |||||
キーワード | ||||||
主題 | Kurobe River | |||||
主題Scheme | Other | |||||
キーワード | ||||||
主題 | stocking | |||||
主題Scheme | Other | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15083/00040733 | |||||
ID登録タイプ | JaLC | |||||
著者 |
Kuroki, Mari
× Kuroki, Mari× Ma, Tao× Ishida, Rikizo× Tsukamoto, Katsumi |
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著者所属 | ||||||
著者所属 | Ocean Research Institute, The University of Tokyo | |||||
著者所属 | ||||||
著者所属 | Fisheries Environment Institute | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | In order to discuss the influence of dam discharge on the movement of ayu Plecoglossus altivelis in a river and the stocking effectiveness of released ayu, the migratory history of 83 juveniles of ayu (standard length=67.9-142.4mm sL) collected in the Kurobe River, Japan during 25 June-23 August 2004 was determined by otolith microchemistry, and the origin of fish was identified as being either native amphidromous ayu or released amphidromous or landlocked fish. Except for otoliths with abnormal morphology (N=10), most specimens (96%, N=70) had inner layers (radius:>400μm) of higher Sr: Ca ratios and outer ones of low values. These specimens were identified as native amphidromous fish that migrated upstream from the sea. Only 4% (N=3) were released ayu (reared fish), which were further divided into two origins, amphidromous fish (N=2) with smaller inner layers (radius:<400μm) of high Sr: Ca ratios, and landlocked fish (N=1) with constantly low values over the whole otolith. There were no specimens with an increase in Sr: Ca ratios in the outer layers of the low Sr: Ca region of the otolith after their upstream migration in spring, suggesting that it is unlikely that any of these ayu had been washed-out from the river by cold and turbulent river water. | |||||
書誌情報 |
Coastal marine science 巻 30, 号 2, p. 425-431, 発行日 2006-06-25 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 13493000 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA11957899 | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | application/pdf | |||||
日本十進分類法 | ||||||
主題 | 452 | |||||
主題Scheme | NDC | |||||
出版者 | ||||||
出版者 | International Coastal Research Center, Ocean Research Institute, the University of Tokyo | |||||
出版者別名 | ||||||
東京大学海洋研究所国際沿岸海洋研究センター |