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Study of dispersal and retention of estuarine fishes in relation to the diadromy

Research Project

Project/Area Number 26850125
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Aquatic bioproduction science
Research InstitutionJapan Fisheries Research and Education Agency

Principal Investigator

Yokouchi Kazuki  国立研究開発法人水産総合研究センター, 増養殖研究所, 研究員 (50723839)

Project Period (FY) 2014-04-01 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords通し回遊 / 耳石 / 比重 / 走光性 / 日齢 / 成長速度 / 走行性 / 広塩性魚類 / 河川内分布
Outline of Final Research Achievements

In this study, data analyses for riverine distribution, experiments of specific gravity, phototaxis and body growth, and estimations of individual environmental histories of euryhaline fish larvae were conducted using the Japanese grenadier anchovy Coilia nasus, which was intended to understand the dispersal and the retention of larvae having poor swimming ability in estuaries. As a result of this study, individuals dispersed in the river during egg to larval stage, and durations of the stay in the river showed large variation among individuals. Results suggested that larvae stayed surface layer of water column by swimming with positive phototaxis, and minimized volume of their swim-bladder for the reduction of resistance to water currents and downward transports by river flow during daytime. In the nighttime, it was thought that larvae stopped to swim, enlarged their swim-bladder to slow down to sink and kept the depth.

Report

(3 results)
  • 2015 Annual Research Report   Final Research Report ( PDF )
  • 2014 Research-status Report
  • Research Products

    (2 results)

All 2015

All Presentation (1 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results) Book (1 results)

  • [Presentation] Otolith Aging and Geochemical Analysis for Migratory Ecology: Brief Review and a Case of the Japanese Eel2015

    • Author(s)
      K. Yokouchi, T. Yamamoto
    • Organizer
      American Fisheries Society Annual Meeting
    • Place of Presentation
      Portland, OR, USA
    • Year and Date
      2015-08-20
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research / Invited
  • [Book] Otolith geochemical analysis for stock discrimination and migratory ecology of tunas. In Biology and ecology of bluefin tuna. (T. Kitagawa and S. Kimura, Eds.) pp. 225–257.2015

    • Author(s)
      Y. Amano, J.-C. Shiao, T. Ishimura, K. Yokouchi, K. Shirai
    • Total Pages
      433
    • Publisher
      Science Publishers (CRC Press), New Hampshire, USA.
    • Related Report
      2015 Annual Research Report

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Published: 2014-04-04   Modified: 2017-05-10  

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