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2000 Fiscal Year Final Research Report Summary

Studies on response processes of ocean ecosystem to environmental changes and effect on the replacement of dominant pelagic fish species

Research Project

Project/Area Number 10306012
Research Category

Grant-in-Aid for Scientific Research (A).

Allocation TypeSingle-year Grants
Section一般
Research Field General fisheries
Research InstitutionOcean Research Institute, University of Tokyo

Principal Investigator

SUGIMOTO Takashige  Ocean Res. Inst. University of Tokyo Professor, 海洋研究所, 教授 (40004428)

Co-Investigator(Kenkyū-buntansha) MATSUDA Hiroyuki  Ocean Res. Inst. University of Tokyo Associate Professor, 海洋研究所, 助教授 (70190478)
WATANABE Yoshiro  Ocean Res. Inst. University of Tokyo Professor, 海洋研究所, 教授 (90280958)
TERAZAKI Makoto  Ocean Res. Inst. University of Tokyo Professor, 海洋研究所, 教授 (20111586)
KIMURA Shingo  Ocean Res. Inst. University of Tokyo Associate Professor, 海洋研究所, 助教授 (90202043)
KOMATSU Teruhisa  Ocean Res. Inst. University of Tokyo Associate Professor, 海洋研究所, 助教授 (60215390)
Project Period (FY) 1998 – 2000
Keywordsmarine living resources / pelagic fish / plankton / food web / ocean ecosystem / global change / population dynamics Western North Pacific
Research Abstract

The research were focussed on the following unresolved problems relating to the recruitment processes of small pelagic fish. (1) effect of larval transport and retension, (2) effect of water temperature and feeding environment on larval growth (3) effect of larval growth rate and probability contacting with predator on the larval morality (4) improvement models on the replacement mechanism of small pelagic fish species. For this purpose, intensive field survey on the Kuroshio and Kuroshio-Oyashio transition regions, laboratory experiment, historical data analysis, were conducted. Main results are as followings.
(1) By using historical data and supplying rate of sardine larvae in the Kuroshio, its retension area is increased during the period of large meander path of the Kuroshio. However, retension rate of anchovy larvae in the spawning ground in the Enshu-Nada Sea is increased during the period. It was found that this replacement of two modes of the Kuroshio path affect on the replacement of dominance between sardine and anchovy. (2) Based on the analysis of otolith and stomach content of anchovy juvenile, importance of water temperature and food density on the growth rate, the timing of metamorphosis on the recruitment rate were made clear. (3) Chlorophyll concentration in the Kuroshio-Oyashio transition region in spring were in high level during 1970s and 1980s. It was found that this corresponds to the intensified period of southward expansion of the Oyashio area and also to the period of better recruitment of Japanese sardine. (4) Timing of spring bloom in the Kuroshio-Oyashio transition region was delayed by about one month during later 1970s and earlier 1980s. This fact supports the importance of match-mismatch between pelagic fish and food plankton. (5) It was pointed out that overfishing of Japanese common mackerel in the unmatured stage suppressed its recovery of the stock and elongation of the anchovy stock.

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 杉本隆成: "西部北大平洋におけるプランクトン量と環境の10年-10数年スケールの変動"水産海洋研究. 64(3). 173-178 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Terazaki,M.: "Utilization of Biological Data for IODE system in the WESTPAC area."In : Proceedings of ICWP'99 conference, JODC, Japan Coast Guard. 163-165 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kimura,R.: "Nutritional condition of first-feeding larvae of sardine caught in the Kuroshio current areas."ICES Journal of Marine Science.. 57. 240-248 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Matsuda,H.: "Rproductive value, harvest value, impact multiplier as indicators for maximum sustainable fisheries."Environmental Economics and Policy Studies. 2. 129-146 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 池上彰一: "ニューラルネットワークを用いたモジャコ漁況の予測."黒潮の資源海洋研究. 1. 39-43 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kimura S.: "Two processes by which short-period fluctuations in the meander of the kuroshio affect its countercurrent."Deep-Sea Rec.. I. 745-754 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sugimoto T.: "Impact of E1 Nino Events on Marine Livig Resources and Their Physical Environments in the Western North Pacific."Progress of Oceanogr. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sainz-Trapaga: "Three dimensional velocity field anSd cross-frontal water exchange in the Kuroshio Extension."Proc. of the Int. Mar. Sci. Symp. On Ecosystem Dynamics of the Kuroshio-Oyashio Transition Region, J.Oceanogr.. 56. 79-92 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Terazaki, M.: "Feeding of carnivous zooplankton, chaetognath in the Pacific, In : Dynamics and Charaterization of Marine Organic Matter."Tanoue, E.and T.Hama (editor), TERAPUB, Tokyo. 257-276 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Terazaki, M.: "Utilization of Biological Data for IODE system in the WESTPAC area."In : Proceedings of ICWP'99 conference, JODC, Japan Coast Guard. 163-165 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Matsuda H.: "Rproductive value, harvest value, impact multiplier as indicators for maximum sustainable fisheries."Environmental Economics and Policy Studies. 2. 129-146 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Matsuda H.: "Extinction risk assessment of declining wild populations : in the case of the southern bluefin tuna."Researches on Population Ecology. 40. 271-278 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ikenoue S.: "Prediction ofb larval-yellowtail catch using a neural network."Fisheries biology andoceanography in the Kuroshio. 39-43 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kimura S.: "Two processes by which short-period fluctuations in the meander of the kuroshio affect its countercurrent."Deep-Sea Rec.I. 47. 745-754 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kimura, R.: "Nutritional condition of first-feeding larvae of sardine caught in the Kuroshio current areas."ICES Journal of Marine Science. 57. 240-248 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nakata, H.: "Alternating dominance of postlarval sardine and anchovy caught by coastal fishery in relation to the Kuroshio meander in the Enshu-nada Sea."Fish. Oceanogr.. 9(3). 248-258 (2000)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2002-03-26  

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