2010 Fiscal Year Final Research Report
Analysis of growth and migration history in terms of migratory dimorphism in Japanese anchovy
| Project/Area Number |
20580195
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
General fisheries
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| Research Institution | The University of Tokyo |
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Principal Investigator |
AOKI Ichro The University of Tokyo, 大学院・農学生命科学研究科, 教授 (40114350)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 水産資源 / 系群 / 耳石 / 日周輪 / 微量元素 |
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| Research Abstract |
Rearing experiments on anchovy revealed that micro-increments in otolith were formed daily above 15℃ of water temperature but disappeared below 12℃, and that they were also affected by food conditions. The chemical composition of 6-8 kinds of trace elements including Mn and Sr in otolith discriminated sampling areas at 60-100% of accuracy. Errors occurred between neighboring areas. It was suggested that anchovy are distributed and grow with spatially aggregated but weak coherence from early life stage.
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