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Darkness represses the onset of downstream migration in hatcheryreleased chum salmon, Oncorhynchus keta, fry
https://doi.org/10.15083/00040729
https://doi.org/10.15083/0004072960eb27e9-26c3-4c20-87fb-8f0cf201c350
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
CMS310105.pdf (411.6 kB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2008-10-17 | |||||
| タイトル | ||||||
| タイトル | Darkness represses the onset of downstream migration in hatcheryreleased chum salmon, Oncorhynchus keta, fry | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | chum salmon | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Oncorhynchus keta | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | downstream migration | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | illumination | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | thyroxine | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | T4 surge | |||||
| 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 | 10.15083/00040729 | |||||
| ID登録タイプ | JaLC | |||||
| 著者 |
OJIMA, Daisuke
× OJIMA, Daisuke× HARADA, Masafumi× IWATA, Munehico |
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| 著者所属 | ||||||
| 著者所属 | Laboratory of Ecophysiology, School of Fisheries Sciences, Kitasato University | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Downstream migration and plasma thyroxine (T4) levels in hatchery reared chum salmon, Oncorhynchus keta, fry were investigated late in the migration season. Groups of 1.7.6.7 million fry were discharged by opening gates of the raceways at 09:30 h for a daytime release and at 18:30 h for a nighttime release experiments. A peak in the number of migrating fry and T4 surge were detected simultaneously, 1.1.5 h after the release in the daytime release. In nighttime release, the peak of T4 surge occurred 3 h after the release, and the number of the migrating fry peaked 8 h and 11 h after the release. In dark treatment, although the control group showed peaks within 2 h of the gate opening, the downstream migration of the dark-treated fish was repressed in daytime and small number of migrating fish was observed 3 h and 10 h after the gate opening, These results suggest that darkness represses the onset of downstream migration in chum fry late in the migration season, and the T4 surge is not related to the onset of downstream migration during the night. | |||||
| 書誌情報 |
Coastal marine science 巻 31, 号 1, p. 40-46, 発行日 2007-06-25 |
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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 | ||||||
