2017 Fiscal Year Final Research Report
Analysis of migration history using the stable oxygen isotopic values of otolith for the Medaka
| Project/Area Number |
26550009
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Shimane University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
坂井 三郎 国立研究開発法人海洋研究開発機構, 生物地球化学研究分野, 技術研究員 (90359175)
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| Research Collaborator |
TAKUWA Tsuyoshi 宍道湖自然館ゴビウス, 学芸員
TAKASU Akira 島根大学, 大学院 総合理工学研究科
Dettman David L. アリゾナ大学, 技術研究員
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| Project Period (FY) |
2014-04-01 – 2018-03-31
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| Keywords | 耳石 / メダカ / 酸素安定同位体比 / 塩分 / 回遊 |
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| Outline of Final Research Achievements |
There are many studied on fishes migrating between the sea and fresh water areas using Sr-Ca ratio in the otolith, however, it is difficult to describe the difference between brackish and sea water areas by that ratio. We made an attempt to use the oxygen stable isotopic study for estimating migration history of fishes in the brackish area. The relationship between water salinity and oxygen stable isotopic values in otoliths was examined for Oryzias latipes, caught from fresh and brackish water areas of Hii River system. The relationships between salinity and δ18O values of water and otolith are respectively linear. Rareing experiments in some conditions of controlled temperture and salinity showed that the relationships between salinites and δ18O values are also linear and the temperature effect is quite limited. We suggest that the analysis of oxygen stable isotope in otoliths will provide a powerful tool for the documentation of fish migratory behavior in brackish waters.
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| Free Research Field |
生態環境工学
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