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Biological characteristics of silver-phase Japanese eels, Anguilla japonica, collected from Hamana Lake, Japan
https://doi.org/10.15083/00040704
https://doi.org/10.15083/0004070480ea3c28-f95a-479e-8546-c608460d50a5
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
CMS330107.pdf (476.2 kB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2010-05-28 | |||||
| タイトル | ||||||
| タイトル | Biological characteristics of silver-phase Japanese eels, Anguilla japonica, collected from Hamana Lake, Japan | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Anguilla japonica | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | silver eels | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | sex ratio | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | silvering index | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | GSI | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | morphometric index | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | age | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | growth | |||||
| 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 | 10.15083/00040704 | |||||
| ID登録タイプ | JaLC | |||||
| 著者 |
YOKOUCHI, Kazuki
× YOKOUCHI, Kazuki× SUDO, Ryusuke× KAIFU, Kenzo× AOYAMA, Jun× TSUKAMOTO, Katsumi |
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| 著者所属 | ||||||
| 著者所属 | Ocean Research Institute, The University of Tokyo, Japan | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The biological characteristics of 259 silver-phase Japanese eels, Anguilla japonica, were investigated in Hamana Lake, Japan from 2003 to 2007, to obtain basic data for this species at the downstream migration. Their silvering stage, condition factor, three internal (gonad-somatic index: GSI, hepato-somatic index and gut index) and two morphometric (fin index and eye index) indices were calculated. The overall sex ratio tended to be female (61%), but the sex ratio differed among years and months. Silver eels of S1 stage (early silver) were predominant than S2 (late silver) for both sexes (female: 67%, male: 77%). Female eels attained to larger size (mean: 659.3 mm) and older age (9.9 years) than males (527.7 mm and 8.3 years). The GSI increased from October to December whereas gut index decreased with months, but significant change in morphometric indices were not found within silver-phase. The results of this study suggest that silver-phase Japanese eels have a wide range of the biological characteristics, but significant differences can occur in sex ratio and the proportion of silvering stages among years, and in internal indices within silver-phase during their downstream migration season. | |||||
| 書誌情報 |
Coastal marine science 巻 33, 号 1, p. 54-63, 発行日 2009-08-20 |
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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Scheme | NDC | |||||
| 主題 | 452 | |||||
| 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 | ||||||
