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Mechanism of timing of downstream migration for Japanese eels

Research Project

Project/Area Number 18K14510
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 40030:Aquatic bioproduction science-related
Research InstitutionThe University of Tokyo (2021-2022)
Kobe University (2018-2020)

Principal Investigator

Itakura Hikaru  東京大学, 大気海洋研究所, 助教 (40749040)

Project Period (FY) 2018-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords回遊開始機構 / ニホンウナギ / 春機発動 / 標識再捕 / 耳石成長解析 / 回遊意思決定 / 成長履歴解析 / 耳石分析 / 標識放流実験 / 銀ウナギ / 成長解析 / 成長履歴 / ウナギ属魚類 / 生息域利用 / 降河回遊開始 / 標識再捕実験 / 降河回遊開始機構
Outline of Final Research Achievements

The objective of this study was to establish a method to predict the onset of downstream migration of Japanese eels at the individual level in summer, and to clarify the process of decision-making mechanisms related to the onset of the migration of eels. Using mark-recapture experiment of female Japanese eels in an artificial pond, it was found that the diameter of egg of puberty individuals was significantly larger than that of non-puberty individuals in fall, indicating that the onset of migration of eels in fall is predictable at the individual level during summer. In addition, growth analysis of eels collected in Lake Jinzei, Shimane Prefecture, revealed that individuals having high growth pattern start their migration at younger age than low growth pattern individuals.

Academic Significance and Societal Importance of the Research Achievements

本研究の実施により、これまで困難であった秋季におけるウナギ属魚類の銀化/回遊開始予測について、夏季に卵径を測定して春機発動の有無を調べることで、秋季の銀化/回遊開始を事前に個体レベルで予測することが可能となった。これにより、黄ウナギをその年に銀化/回遊開始個体か残留個体かに判別することで両者の成長パターンなどの比較から、ウナギ属魚類の回遊開始に関わる意思決定機構の解明が可能となるため学術的意義は高い。また、事前の銀化/回遊開始の予測は銀ウナギの確保を可能とするため、社会的意義も高いものと判断できる。

Report

(6 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (26 results)

All 2022 2021 2020 2019 2018 Other

All Int'l Joint Research (1 results) Journal Article (16 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 16 results,  Open Access: 11 results) Presentation (8 results) (of which Int'l Joint Research: 2 results) Book (1 results)

  • [Int'l Joint Research] Institute of Fisheries Science/National Taiwan University(中国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Tracking oxy-thermal habitat compression encountered by Chesapeake Bay striped bass through acoustic telemetry2021

    • Author(s)
      Itakura Hikaru、O’Brien Michael H P、Secor David
    • Journal Title

      ICES Journal of Marine Science

      Volume: 78 Issue: 3 Pages: 1049-1062

    • DOI

      10.1093/icesjms/fsab009

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Large contribution of pulsed subsidies to a predatory fish inhabiting large stream channels2021

    • Author(s)
      Itakura Hikaru、Miyake Yoichi、Kitagawa Takashi、Sato Takuya、Kimura Shingo
    • Journal Title

      Canadian Journal of Fisheries and Aquatic Sciences

      Volume: 78 Issue: 2 Pages: 144-153

    • DOI

      10.1139/cjfas-2020-0004

    • NAID

      120007017125

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Habitat preference, movements and growth of giant mottled eels, Anguilla marmorata, in a small subtropical Amami-Oshima Island river2020

    • Author(s)
      Itakura Hikaru、Wakiya Ryoshiro
    • Journal Title

      PeerJ

      Volume: 8 Pages: e10187-e10187

    • DOI

      10.7717/peerj.10187

    • NAID

      120006938917

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Estimations of Riverine Distribution, Abundance, and Biomass of Anguillid Eels in Japan and Taiwan Using Environmental DNA Analysis2020

    • Author(s)
      Hikaru Itakura , Ryoshiro Wakiya , Masayuki K. Sakata , Hsiang-Yi Hsu , Shih-Chong Chen , Chih-shao Yang , Satoshi Yamamoto , Toshifiumi Minamoto
    • Journal Title

      Zoological Studies

      Volume: -

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Anguillid eels as a surrogate species for conservation of freshwater biodiversity in Japan2020

    • Author(s)
      Itakura H, Wakiya R, Gollock M, Kaifu K
    • Journal Title

      Scientific Reports

      Volume: 10 Issue: 1 Pages: 8790-8790

    • DOI

      10.1038/s41598-020-65883-4

    • NAID

      120006882493

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Past and Lost Influence of the Kuroshio on Estuarine Recruitment of Anguilla japonica Glass Eels2020

    • Author(s)
      Miyake Y, Tellier M, Takeshige A, Itakura H, Yoshida A, Kimura S
    • Journal Title

      Journal of Oceanography

      Volume: - Issue: 4 Pages: 1-12

    • DOI

      10.1007/s10872-020-00543-9

    • NAID

      40022290842

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Use of rocks as refuges by Japanese eel, <i>Anguilla japonica</i>, in artificial pond, revealed by acoustic telemetry.2019

    • Author(s)
      海部健三 , 竹野遼馬 , 市川光太郎 , 高木淳一 , 脇谷量子郎 , 板倉光 , 平江多績 , 猪狩忠光 , 三田村啓理 , 荒井修亮
    • Journal Title

      Ecology and Civil Engineering

      Volume: 22 Issue: 1 Pages: 83-92

    • DOI

      10.3825/ece.22.83

    • NAID

      130007705207

    • ISSN
      1344-3755, 1882-5974
    • Year and Date
      2019-07-28
    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Habitat use of Japanese eel, <i>Anguilla japonica</i>, in brackish water lake, revealed by acoustic telemetry.2019

    • Author(s)
      海部健三 , 竹野遼馬 , 市川光太郎 , 三田村啓理 , 高木淳一 , 脇谷量子郎 , 板倉光 , 石井潤 , 荒井修亮
    • Journal Title

      Ecology and Civil Engineering

      Volume: 22 Issue: 1 Pages: 73-82

    • DOI

      10.3825/ece.22.73

    • NAID

      130007705216

    • ISSN
      1344-3755, 1882-5974
    • Year and Date
      2019-07-28
    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Distribution of naturally recruited wild Japanese eels in Japan revealed by otolith stable isotopic ratios and document investigation2019

    • Author(s)
      YONETA AKIHITO、ITAKURA HIKARU、ARAI KOHMA、KAIFU KENZO、YOSHINAGA TATSUKI、MIYAKE YOICHI、SHIRAI KOTARO、KIMURA SHINGO
    • Journal Title

      NIPPON SUISAN GAKKAISHI

      Volume: 85 Issue: 2 Pages: 150-161

    • DOI

      10.2331/suisan.18-00038

    • NAID

      130007622909

    • ISSN
      0021-5392, 1349-998X
    • Year and Date
      2019-03-15
    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Anthropogenic impacts on the distribution of wild and cultured Japanese eels in the Tone River watershed, Japan, from otolith oxygen and carbon stable isotopic composition2019

    • Author(s)
      Arai K, Itakura H, Yoneta A, Kaifu K, Shirai K, Miyake Y, Kimura S
    • Journal Title

      Environmental Biology of Fishes

      Volume: 102 Issue: 11 Pages: 1405-1420

    • DOI

      10.1007/s10641-019-00915-1

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Age, growth, and sex ratios of the giant mottled eel, Anguilla marmorata, in freshwater habitats near its northern geographic limit: a comparison to tropical regions2019

    • Author(s)
      Wakiya R, Itakura H, Kaifu K
    • Journal Title

      Zoological Studies

      Volume: 58

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Environmental DNA analysis reveals the spatial distribution, abundance, and biomass of Japanese eels at the river‐basin scale2019

    • Author(s)
      Itakura Hikaru、Wakiya Ryoshiro、Yamamoto Satoshi、Kaifu Kenzo、Sato Takuya、Minamoto Toshifumi
    • Journal Title

      Aquatic Conservation: Marine and Freshwater Ecosystems

      Volume: 29 Issue: 3 Pages: 361-373

    • DOI

      10.1002/aqc.3058

    • NAID

      120006599158

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Distribution of wild and stocked Japanese eels in the lower reaches of the Tone River catchment revealed by otolith stable-isotope ratios2018

    • Author(s)
      Itakura Hikaru、Arai Kohma、Kaifu Kenzo、Shirai Kotaro、Yoneta Akihito、Miyake Yoichi、Secor David H.、Kimura Shingo
    • Journal Title

      Journal of Fish Biology

      Volume: 93 Issue: 5 Pages: 805-813

    • DOI

      10.1111/jfb.13782

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Multiple habitat use of Japanese sea bass Lateolabrax japonicus in the estuary region of the Tone River system, implied by stable isotope analysis2018

    • Author(s)
      Miyake Yoichi、Itakura Hikaru、Takeshige Aigo、Onda Hiroaki、Yamaguchi Akira、Yoneta Akihito、Arai Kohma、Hane Yulina V.、Kimura Shingo
    • Journal Title

      Ichthyological Research

      Volume: 66 Issue: 1 Pages: 172-176

    • DOI

      10.1007/s10228-018-0655-2

    • NAID

      40021806379

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Correction to: Predation on glass eels of Japanese eel Anguilla japonica in the Tone River Estuary, Japan2018

    • Author(s)
      Miyake Yoichi、Takeshige Aigo、Itakura Hikaru、Itoh Hajime、Onda Hiroaki、Yamaguchi Akira、Yoneta Akihito、Arai Kohma、Hane Yulina V.、Kimura Shingo
    • Journal Title

      Fisheries Science

      Volume: 84 Issue: 6 Pages: 1015-1016

    • DOI

      10.1007/s12562-018-1257-7

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Depletion of naturally recruited wild Japanese eels in Okayama, Japan, revealed by otolith stable isotope ratios and abundance indices2018

    • Author(s)
      Kaifu Kenzo、Yokouchi Kazuki、Higuchi Tomihiko、Itakura Hikaru、Shirai Kotaro
    • Journal Title

      Fisheries Science

      Volume: 84 Issue: 5 Pages: 757-763

    • DOI

      10.1007/s12562-018-1225-2

    • NAID

      40021650810

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] 北西太平洋におけるオオウナギの幼生分散過程2022

    • Author(s)
      祝 倩怡・熊 觀梅・萩原聖士・脇谷量子郎・ 羽根由里奈・板倉 光・木村伸吾
    • Organizer
      令和4年度日本水産学会春季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Tracking oxy-thermal habitat compression encountered by Chesapeake Bay striped bass through acoustic telemetry2021

    • Author(s)
      Itakura Hikaru、O’Brien Michael H P、Secor David
    • Organizer
      151st Annual Meeting American Fisheries Society
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 奄美大島におけるオオウナギの年齢と成長2019

    • Author(s)
      脇谷量子郎・板倉光・海部健三
    • Organizer
      東アジア鰻学会、第二回研究発表会
    • Related Report
      2018 Research-status Report
  • [Presentation] 天然ニホンウナギの生殖腺の性分化2019

    • Author(s)
      堀内萌未・中司大智・長谷川祐也・萩原聖士・板倉光・山下洋・ 久米学・寺島佑樹・塚本勝巳・井尻成保・足立伸次
    • Organizer
      東アジア鰻学会、第二回研究発表会
    • Related Report
      2018 Research-status Report
  • [Presentation] 奄美大島におけるオオウナギの年齢と成長2019

    • Author(s)
      脇谷量子郎・板倉光・海部健三
    • Organizer
      日本水産学会春季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 天然ニホンウナギにおける形態的性分化開始時期2019

    • Author(s)
      堀内萌未・中司大智・長谷川祐也・萩原聖士・板倉光・山下洋・ 久米学・寺島佑樹・塚本勝巳・井尻成保・足立伸次
    • Organizer
      日本水産学会春季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] ウナギ属魚類は淡水域の生物多様性保全の指標種となる2019

    • Author(s)
      板倉光・脇谷量子郎・海部健三
    • Organizer
      日本水産学会春季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Distribution of naturally recruited Japanese eels in rivers as inferred from otolith stable isotope ratios2018

    • Author(s)
      Itakura H, Arai K, Yoneta A, Kaifu K, Shirai K, Kimura S
    • Organizer
      6th International Otolith Symposium
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Book] ウナギの科学2019

    • Author(s)
      塚本 勝巳
    • Total Pages
      240
    • Publisher
      朝倉書店
    • ISBN
      9784254485028
    • Related Report
      2019 Research-status Report

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Published: 2018-04-23   Modified: 2024-01-30  

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