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四万十川河口域におけるアユの初期生活史に関する研究
http://hdl.handle.net/10126/4395
http://hdl.handle.net/10126/439513f469b6-0c83-400b-a73b-4860a8b79e91
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
marine23-113.pdf (5.1 MB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2010-03-17 | |||||
| タイトル | ||||||
| タイトル | 四万十川河口域におけるアユの初期生活史に関する研究 | |||||
| 言語 | ja | |||||
| タイトル | ||||||
| タイトル | Study on the Early Life History of Ayu in the Shimanto Estuary, Japan | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| キーワード | ||||||
| 言語 | en | |||||
| 主題 | Ayu | |||||
| キーワード | ||||||
| 言語 | en | |||||
| 主題 | early life history | |||||
| キーワード | ||||||
| 言語 | en | |||||
| 主題 | hatch date | |||||
| キーワード | ||||||
| 言語 | en | |||||
| 主題 | Shimanto Estuary | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | departmental bulletin paper | |||||
| 著者 |
高橋, 勇夫
× 高橋, 勇夫 |
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| 著者別名 | ||||||
| 姓名 | Takahashi, Isao | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The ayu Plecoglossus altivelis altivelis, is an amphidromous fish with a life span of only one year. This is one of the most important species for both commercial fisheries and sport fishing in Japan. Hatching occurs about two weeks after spawning in thelower reaches of rivers in autumn and yolk-sac larvae drift down into the coastal waters, where they remain throughout the larval and early juvenile stages. In spring, juveniles ascend the rivers, where they feed attached algae on rocks and grow over the summer. They mature the following autumn, and spawn in the lower reaches of rivers after a downstream migration by adult.Much works has been on the ecology of the ayu in a river, but little is done about the early life history of ayu before 1980s. Studies on the early life history of ayu have progressed since the 1980s when the main nursery ground of the ayu was found to be in the shallow waters such as the surf zone. In recent years, some studies on larval and juvenile ayu proved us the information on growth, migration and so on forth in the coastal waters. However, the habitat, development, mortality and so forth in the early stages are not yet fully understood. Since 1985, I have conducted the survey of larval and juvenile ayu in the Shimanto Estuary, and found that a number of the larvae and juveniles of ayu remain in the estuary, and achieve higher growth rates. This indicates the importance of the estuary as a nursery ground for ayu.In the present study, I try to detail the early life history of ayu, especially for migration, mortality and development, which are still unknown, in the Shimanto Estuary, and clear the significance of the estuary for ayu. | |||||
| 書誌情報 |
Bulletin of marine sciences and fisheries, Kochi University 巻 23, p. 113-173, 発行日 2005-03-31 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 03879763 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AA10778872 | |||||
| フォーマット | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | application/pdf | |||||
| 著者版フラグ | ||||||
| 出版タイプ | VoR | |||||
| 出版者 | ||||||
| 出版者 | 高知大学海洋生物教育研究センター | |||||
| 言語 | ja | |||||
