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Opportunistic feeding habit of swordtip squid Uroteuthis edulis by areas, seasons and capture methods

Research Project

Project/Area Number 16K07844
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Aquatic bioproduction science
Research InstitutionNagasaki University

Principal Investigator

MATSUSHITA Yoshiki  長崎大学, 水産・環境科学総合研究科(水産), 教授 (30372072)

Co-Investigator(Kenkyū-buntansha) 菅 向志郎  長崎大学, 水産・環境科学総合研究科(水産), 准教授 (60569185)
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsケンサキイカ / 漁法 / 餌生物 / 空胃率 / 共食い / DNA分析 / 高次生物 / 共喰い / 水産学
Outline of Final Research Achievements

We collected 715 individuals of swordtip squid Uroteuthis edulis from fisheries that used towed gear, setnet and jig fishing with artificial light in the East China Seas and the western part of the Sea of Japan. Their stomach contents were analyzed by DNA base sequencing. We also analyzed ratios of empty stomach and cannibalization by using the GLM logistic analysis. The empty stomach ratio was influenced by areas, depths and fishing methods while the cannibalization ratio was influenced by the fishing methods.
From the stomach content analysis by DNA base sequencing, we identified 28 fish species and 5 invertebrates. The most observed species was Japanese anchovy Engraulis japonicus (22%), followed by swordtip squid (15%) and banded blue sprat Spratelloides gracilis (11%). In addition, high commercial value species including tiger puffer Takifugu rubripes and yellowtail Seriola quinqueradiata were found.

Academic Significance and Societal Importance of the Research Achievements

イカ類は鋭い口器を用いて餌を食べるため,検鏡による胃内容物の観察,特定は難しく,西日本における重要なイカ資源であるケンサキイカの食性については少数の地域で定性的な観察結果の報告しか無かった。本研究により,広い水域においてケンサキイカの食性が詳細に明らかになった。そして餌生物の中には水産重要種で高次捕食者でもあるブリ,マハタ,クエ,マルソウダ,ヒラソウダ,トラフグが含まれたことも初めて示された。しかしこれらの観察数は少なかった。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (5 results)

All 2019 2017 2016

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (3 results)

  • [Journal Article] Difference in the light source power required for catching swordtip squid <i>Photololigo edulis</i> and Japanese common squid <i>Todarodes pacificus</i> estimated from the catch experiments by using LED panels2017

    • Author(s)
      舛田 大作、甲斐 修也、松下 吉樹
    • Journal Title

      NIPPON SUISAN GAKKAISHI

      Volume: 83 Issue: 2 Pages: 148-155

    • DOI

      10.2331/suisan.16-00001

    • NAID

      130005501953

    • ISSN
      0021-5392, 1349-998X
    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] 漁業技術としての光2016

    • Author(s)
      松下吉樹
    • Journal Title

      照明学会誌

      Volume: 100 Pages: 483-487

    • Related Report
      2016 Research-status Report
    • Peer Reviewed
  • [Presentation] 東シナ海で使用される調査トロール網の漁獲性能の比較2019

    • Author(s)
      鄭程模・松下吉樹・ 酒井 猛・川内陽平・依田真里・青沼佳方
    • Organizer
      平成31年度 日本水産学会春季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 長崎県の定置網漁獲動向と漁場環境の影響2017

    • Author(s)
      舛田大作,松下吉樹
    • Organizer
      平成29年度日本水産学会春季大会
    • Place of Presentation
      東京海洋大学(東京都港区)
    • Related Report
      2016 Research-status Report
  • [Presentation] Long-term catch trends of trap-net fisheries set along Tsushima Current2017

    • Author(s)
      Sen Hao,舛田大作, 渡邊俊輝,松下吉樹
    • Organizer
      平成29年度日本水産学会春季大会
    • Place of Presentation
      東京海洋大学(東京都港区)
    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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