Life history of chum salmon Onchorhynchus keta during the period migrating in the North Pacific inferred from scale and otolih elemental and stable isotopic compositions
| Project/Area Number |
15H04543
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Aquatic bioproduction science
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Otake Tsuguo 東京大学, 大気海洋研究所, 特任研究員 (20160525)
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| Co-Investigator(Kenkyū-buntansha) |
白井 厚太朗 東京大学, 大気海洋研究所, 助教 (70463908)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥11,180,000 (Direct Cost: ¥8,600,000、Indirect Cost: ¥2,580,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
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| Keywords | サケ / 鱗 / 耳石 / 安定同位体比 / 微量元素 / 酸素・炭素安定同位体比 / 微量元素組成 / 沖合域 / 生活史 / 生態 |
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| Outline of Final Research Achievements |
Stable isotope analysis (SIA;δ15N、δ13C) of scales from chum salmon (Oncorhynchus keta) ascending the Tsugaruishi River (Iwate Prefecture) in the 1980s and 2010s revealed that food item of 2010s fish during their migration in the North Pacific did not differ from that of 1980s fish. Younger aged (two-year-old) fish comprised of small sized one has higher relative growth rate during last growth period (RGR) with higher scale δ15N than fish of higher ages, suggesting that they inhabited an feeding environment that yielded higher SI in early migration period. It also indicates that they might have a migration route different from the other aged fish havinglowerRGR and lower SI. Otolith elemental analysis revealed that Ba/Ca, Li/Ca and Sr/Ca periodically fluctuated in the otolith portion corresponding to the migration period in the North Pacific. Those peak positions and levels were different among the individual origins, suggesting that migration route varied among origins.
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Report
(4 results)
Research Products
(16 results)
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[Journal Article] Stable isotopic composition of anguilliform leptocephali and other food web components from west of the Masnarene Plateau2015
Author(s)
Feunteun E., Miller M.J., Carpentier A., Aoyama J., Dupuy C., Kuroki M., Pagano M., Reveillac E., Sellos D., Watanabe S., Tsukamoto K., Otake T.
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Journal Title
Progress in Oceanography
Volume: 137
Pages: 69-83
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Biodiversity and distribution of leptocephali west of the Mascarene Plateau in the sxouthwestern Indian Ocean2015
Author(s)
Miller M.J., Feunteun E., Aoyama J., Watanabe S., Kuroki M., Lecomte-Finger R., Minegishi Y., Robinet T., Reveilac E., Gagnaire P-A., Berrebi P., Tsukamoto K., Otake T.
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Journal Title
Progress in Oceanography
Volume: 137
Pages: 84-102
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] Otolith stable isotope and trace element analyses to reconstruct migration history of chum salmon Oncorhynchus keta2015
Author(s)
Kawakami T., Shimizu Y., Ogawa G., Saito T., Iida M., Sugihara N., Sato S., Ueda H.,Otake T.
Organizer
Symposium on growth-survival paradigm in early life stages of fish: controversy, synthesis, and multidisciplinary approach
Place of Presentation
中央水産研究所（横浜市）
Year and Date
2015-11-09
Related Report
Int'l Joint Research
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