Investigations of the stock structure of Pacific bluefin tuna using biologging, mathematical modeling and otolith chemical analysis

• Project/Area Number: 24380104
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: General fisheries
• Research Institution: The University of Tokyo
• Principal Investigator: Kitagawa Takashi 東京大学, 大気海洋研究所, 准教授 (50431804)
• Co-Investigator(Kenkyū-buntansha): SHIRAI Kotaro 東京大学, 大気海洋研究所, 助教 (70463908) ; ITOH Sachihiko 東京大学, 大気海洋研究所, 准教授 (80345058)
• Co-Investigator(Renkei-kenkyūsha): ISHIMURA Toyoho 国立高等専門学校機構, 茨城工業高等専門学校, 准教授 (80422012) ; FUJIOKA Ko 水産研究・教育機構, 国際水産資源研究所, 研究員 (50603859)
• Research Collaborator: OHTA Itaru ; FARWELL Charles A.
• Project Period (FY): 2012-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000); Fiscal Year 2015: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2013: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000); Fiscal Year 2012: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
• Keywords: クロマグロ / 回遊 / 数理モデル / 安定同位体 / 耳石 / 微量元素 / 小型記録計 / 分集団 / 酸素安定同位体 / 水産学

Outline of Final Research Achievements

To investigate the stock structure of Pacific bluefin tuna in the Pacific Ocean, analysis of archival tag data was conducted. Analyses of chemical components of fish tissues such as otoliths and muscles as proxies of the environments they experience and mathematical modeling were also conducted. Archival tags have revealed the timing of trans-Pacific migrations from the transition region to the Eastern Pacific that appear to depend on their specific wintering areas in the Western Pacific. Our results also demonstrate that otolith oxygen stable isotope values and muscle nitrogen and carbon stable isotope values can provide precise and accurate estimates of their environments. The mathematical model (extended kinesis model) indicates that fish searching behavior for seeking favorable environments was an important parameter to construct the model.

Research Products

• [Journal Article] IV-2. Biologging studies on fish behavior (2015)
  • Author(s): 北川貴士
  • Journal Title: NIPPON SUISAN GAKKAISHI Volume: 81 Issue: 5 Pages: 872-872
  • DOI: 10.2331/suisan.81.872
  • NAID: 130005102672
  • ISSN: 0021-5392, 1349-998X
  • Peer Reviewed
• [Journal Article] バイオロギングによるマグロ・カツオ類の行動生理学的研究 (2015)
  • Author(s): 北川貴士
  • Journal Title: 海洋と生物 Volume: 221 Pages: 622-625
• [Journal Article] 小型記録計・発信機を用いた魚類の行動・生理解析 (2014)
  • Author(s): 牧口祐也・青木良徳・北川貴士
  • Journal Title: 比較生理生化学 Volume: 31 Pages: 113-118
  • NAID: 130004701711
  • Peer Reviewed / Open Access
• [Journal Article] 微小領域分析法を用いた生物起源炭酸塩骨格の微量元素変動メカニズムに関する研究（2013年度日本地球化学会奨励賞受賞記念論文） (2014)
  • Author(s): 白井厚太朗
  • Journal Title: 地球化学 Volume: 48 Pages: 147-167
  • Peer Reviewed / Open Access
• [Journal Article] Otolith δ18O of Pacific bluefin tuna Thunnus orientalis as an indicator of ambient water temperature. (2013)
  • Author(s): Kitagawa, T., T. Ishimura, R. Uozato, K. Shirai, Y. Amano, A. Shinoda, T. Otake, U. Tsunogai, and S. Kimura
  • Journal Title: Marine Ecology Progress Series Volume: 481 Pages: 199-209
  • DOI: 10.3354/meps10202
  • Peer Reviewed
• [Journal Article] Considerations on diving patterns of bigeye tuna Thunnus obesus based on archival tag data (2013)
  • Author(s): Matsumoto T, Kitagawa T, Kimura S.
  • Journal Title: Fisheries Science Volume: 79 Issue: 1 Pages: 39-46
  • DOI: 10.1007/s12562-012-0571-8
  • NAID: 10031138640
  • Peer Reviewed
• [Journal Article] 体温調節を伴うキハダ(Thunnus albacares)未成魚の鉛直遊泳行動 (2013)
  • Author(s): 青木良徳・北川貴士・木村伸吾
  • Journal Title: 月刊海洋 Volume: 508 Pages: 103-109
• [Journal Article] 電子標識を用いた高度回遊性魚類の生態研究の現状 (2013)
  • Author(s): 北川貴士
  • Journal Title: 月刊海洋 Volume: 508 Pages: 67-70
• [Presentation] Electronic tagging applications and migrations of Pacific bluefin tuna in the western Pacific Ocean (2016)
  • Author(s): Takashi Kitagawa
  • Organizer: Bluefin future symposium
  • Place of Presentation: Monterey, ＵＳＡ
  • Year and Date: 2016-01-18
  • Int'l Joint Research / Invited
• [Presentation] バイオロギングによる魚類の行動研究 (2015)
  • Author(s): 北川貴士
  • Organizer: 平成27年度日本水産学会春季大会シンポジウム「魚類行動生理学の基礎と水産研究への応用」
  • Place of Presentation: 東京海洋大学（東京都港区）
  • Year and Date: 2015-03-27 – 2015-03-31
  • Invited
• [Presentation] 北西太平洋におけるカツオ（Katsuwonus pelamis）の北上に伴う獲得エネルギー量の変化 (2014)
  • Author(s): 青木良徳・北川貴士・岡本俊・松本隆之・清藤秀忠・宮原一・岡本浩明・小倉未基・河村知彦・渡邊良朗
  • Organizer: 平成26年度日本水産学会秋季大会
  • Place of Presentation: 九州大学（福岡市東区）
  • Year and Date: 2014-09-19 – 2014-09-22
• [Presentation] アーカイバルタグ・データを用いたメバチ(Thunnus obesus)未成魚の体温調節機構の解明 (2013)
  • Author(s): 日野晴彦・北川貴士・松本隆之・木村伸吾
  • Organizer: 平成25年度日本水産学会春季大会
  • Place of Presentation: 東京海洋大(東京都)
  • Year and Date: 2013-03-29
• [Presentation] クロマグロ当歳魚の成長に伴う遊泳能力と栄養段階の変化 (2013)
  • Author(s): 北川貴士・藤岡紘
  • Organizer: 平成25年度日本水産学会秋季大会
  • Place of Presentation: 三重大学，三重
• [Presentation] 飼育クロマグロ稚魚（34日齢）の耳石の安定同位体組成～環境指標としての耳石活用を目指して～ (2013)
  • Author(s): 鐵 智美・石村豊穂・北川貴士・鈴木淳・木村伸吾
  • Organizer: 2013年度日本地球化学会年会
  • Place of Presentation: 筑波大学，筑波
• [Presentation] アーカイバルタグ・データを用いたメバチ(Thunnus obesus)未成魚の体温調節機構の解明 (2013)
  • Author(s): 日野晴彦・北川貴士・松本隆之・木村伸吾
  • Organizer: 水産海洋学会研究発表大会
  • Place of Presentation: 京都大学，京都
• [Book] Biology and ecology of bluefin tuna. (2015)
  • Author(s): Kitagawa T, Kimura S eds
  • Total Pages: 433
  • Publisher: CRC press
• [Book] 水産海洋学入門-海洋生物資源の持続的利用 (水産海洋学会 (編)) (2014)
  • Author(s): 北川貴士
  • Total Pages: 320
  • Publisher: 講談社