| Project/Area Number |
25450279
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Aquatic bioproduction science
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| Research Institution | Kitasato University |
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Principal Investigator |
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| Research Collaborator |
SHIOZAKI Takuhei 東京大学, 大気海洋研究所, 特別研究員 (90569849)
IZUKA Takashi 神奈川県水産技術センター内, 水面試験場, 主任研究員
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | サケ / 安定同位体 / 環境変動 / 魚類 / 年齢 / 成長 / 生残 / 鱗 / 安定同位体比 / 餌履歴 / 水温履歴 / シロザケ / レジームシフト / ニジマス |
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| Outline of Final Research Achievements |
The isotopic fractionation factors and turnover rates of young landlocked masu salmon and young char were determined. Carbon and nitrogen stable isotope ratios of age 3 chum salmon scales are measured using archived scales collected from 1975 through 2014 in Iwate prefecture. The variation of both stable isotope ratios tended to be high in recent years, which suggested that the composition of available food items for chum salmon in Bering and Gulf of Alaska form Iwate prefecture could be shifted in the period. The recruitment of age 1 chum salmon from Iwate prefecture was estimated by VPA like method. Even in the period of high abundance of Iwate chum salmon the recruitment levels could be low as in the low abundance period. Moreover the density effect on Iwate chum salmon seems to be still exit even in the recent year.
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