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How do eggs and larvae come to nursery beyond front?

Research Project

Project/Area Number 08660223
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field General fisheries
Research InstitutionThe University of Tokyo

Principal Investigator

MATSUSHITA Katsumi  The University of Tokyo. Graduate School of Agricultural & Life Science. Department of Aquatic Bioscience.Assistant Professor, 大学院・農学生命科学研究科, 助手 (00012039)

Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1997: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1996: ¥1,100,000 (Direct Cost: ¥1,100,000)
KeywordsJapanese anchovy / Recruitment / Drift card / 初期生活史 / 輸送 / 浮遊卵 / 資源変動 / 漂流ハガキ
Research Abstract

Most pelagic fish spawn their eggs at offshore area but the nursery is usually coastal area. We sometimes detected the patches of eggs and larvae at the frontal area as like they were induced to stay at the front. How do the eggs and larvae enter and/or entrainment nursery beyond the front?
I suspected the recruitment success of white bait fishery may be influenced by the entrainment from offshore spawning area beyond the front. The catch of white bait fishery is very fluctuate though the spawning potential is constant. I evaluated the entrainment by using 4 methods.
(1)grid survey the distribution and abundance of eggs at frontal area by HCPS.
(2)grid survey the distribution and abundance of eggs at offshore area by CPS.
(3)spawning daily population index of white bait fishery by otolith analysis.
(4)drift card return ratio to the coastal area.
The HCPS grid survey lines were araanged to cross the front, then I could detect the front and anchovy eggs patches accumulated along frontal area. At the same time. the drift cards were thrown at each continuous station. The survey of offshore distribution of eggs were also carried out by CPS.Furthermore, I collected anchovy larvae of white bait fishery and the data of catch per haul each 5 days between 10-30 days period after eggs distribution survey. The collected larvae were analyzed the otolith and estimated the birth date. Then, I could estimate the spawning daily population index of the day of eggs distribution survey. The spawning daily population index is not directly correlated to the abundance of eggs at frontal area. The drift card return ratio to the coastal area is more important to predict the spawning daily population index. Then, I supposed the recruitment success of white bait fishery is influenced by the physical entrainment.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] Katsumi Matsushita: "How do eggs and larvae come to nursery beyond front?" PICES-GLOBEC Symposium Proceedings.Nanaimo.CANADA. (印刷中). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Katsume Matsushita: "How do eggs and larvae come to nursery beyond front?" PICES-GLOBEC Symposium Proceedings. Nanaimo. CANADA. (in print). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Katsumi Matsushita: "How do eggs and larvae come to nursery beyond front?" ICES Journal. (in print).

    • Related Report
      1997 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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