| Project/Area Number |
23580246
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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 |
General fisheries
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| Research Institution | Nihon University (2013)
The University of Tokyo (2011-2012) |
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Principal Investigator |
WATANABE Shun 日本大学, 生物資源科学部, ポスト・ドクトラル・フェロー (60401296)
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| Project Period (FY) |
2011 – 2013
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2011: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | ボウズハゼ / 黒潮 / 分散 / 初期生活史 / 淡水性両側回遊 / 温帯 / 熱帯 / 生活史戦略 / 仔魚 / 生活史 / 流下 / 加入 / 繁殖 / 肥満度 / 越冬 / ボウズハゼ亜科 / ヨシノボリ属 / 生殖腺指数 / 孕卵数 / 産卵期 / 系統類縁関係 / 両側回遊 |
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| Research Abstract |
During ecological research of Sicyopterus japonicus, which is the only temperate species of the subfamily Sicydiinae, we found larval dispersion by Kuroshio Current, an essential larval dependence on growth in the ocean, and a lack of landlocked or fluvial forms. Their larval dispersion in the ocean and life history characteristics in the river has played a role in the temperate distribution of this species. The Sicydiine larval stage in tropical areas may be required to occur in the ocean for all species, but ayu, sculpins and galaxiids in temperate areas have landlocked or fluvial forms with larvae that do not need to enter the ocean for larval feeding and growth. This suggests that Sicydiine larvae have a high oceanic dependency, whereas ayu, sculpins and galaxiid larvae have a low oceanic dependency. Freshwater amphidromous fish in tropical and temperate areas appear to have developed two different strategies in the evolution of their life histories.
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