| Project/Area Number |
25830149
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Conservation of biological resources
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| Research Institution | Chuo University (2014)
The University of Tokyo (2013) |
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Principal Investigator |
KAIFU Kenzo 中央大学, 法学部, 助教 (30615258)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | ニホンウナギ / 放流 / 耳石 / 安定同位体 / 安定同位体比 / 資源保全 / 酸素安定同位体比 |
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| Outline of Final Research Achievements |
Discrimination method to distinguish wild and stocked Japanese eel was developed. Based on investigation of 20 eel farms in 4 prefectures, we found eel farms use freshwater of 28-30 ℃ in general. Oxygen and carbon stable isotope ratios of 106 wild eels and 314 cultured eels were compared and non-linear discrimination analysis was applied. 98.6% of the training data was correctly discriminated. The discrimination model was then applied to 20 eels caught in Mikata Lake, where no or little eels are now recruiting. 90% of the eels was discriminated as eels once cultured in eel farm, i.e., stocked eels.
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