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Mechanisms of metamorphosis in flatfishes - structural and functional analyses

Research Project

Project/Area Number 02454079
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field General fisheries
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

TANAKA Masaru  Kyoto Univ. Fac. Agr. Assoc. Professor, 農学部, 助教授 (20155170)

Co-Investigator(Kenkyū-buntansha) TOYOHARA H  Kyoto Univ. Fac. Agr. Instructor, 農学部, 助手 (90183079)
SEIKAI T  Kyoto Univ. Fac. Agr. Instructor, 農学部, 助手 (10144338)
Project Period (FY) 1990 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥6,800,000 (Direct Cost: ¥6,800,000)
Fiscal Year 1992: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1991: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1990: ¥4,500,000 (Direct Cost: ¥4,500,000)
KeywordsMetamorphosis / Flatfish / Thyroid hormone / Cortisol / Endocrine function / Digestive system / Immune system / Melanization / ヒラメ / 胃腺 / ヒラメ仔魚 / 胸腺 / 免疫機能 / 仔稚魚 / プロラクチン
Research Abstract

The most typical metamorphosis occurs in flatfishes, associated with eye migration and asymmetrical body transformation. The structural and functional changes occurring during flatfish metamorphosis were examined mainly in the Japanese flounder (hirame).
Marked elevations in tissue thyroid hormone levels were observed at the climax phase of metamorphosis in all seven species examined. Cortisol levels also elevated just prior to thyroid hormone surge in a few species, but it didn't exhibit marked elevation in other species and/or different conditions. During metamorphosis of hirame prominent developmental changes were observed in the digestive system: differentiation of functional stomach with gastric gland and pyloric caeca and marked increase in pepsin-like enzyme activity. These changes were significantly accelerated by exogenous thyroid hormone. Small lymphocytes differentiated during metamorphosis, this suggesting transfer of the body defense mechanism from larval to adult types. Thymus involution occurred at the climax phase related to cortisol surge in hirame. This suggests an intimate relationship between endocrine and immune systems.
Dorso-ventral differentiation of melanization in the epidermis of hirame occurs during metamorphosis, at which melanoblast differentiation was significantly promoted in the ocular side while it was degrade in the blind side. This process seemed to be controlled be melanization promoting factors in the ocular and the inhibiting factors in the blind sides.

Report

(4 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • 1990 Annual Research Report
  • Research Products

    (26 results)

All Other

All Publications (26 results)

  • [Publications] C.Chantanachookhin: "Comparative study of the ontoqeny of the lymphoid organs en three species of marine fish." Aquaculture. 99. 143-155 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Seikai: "Process of piqment cell differentiation in skin on the left and right sides of the flounder during metamorhphsis." Japanese Journal of Ichthyology. 39. 85-92 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Munami: "Life history cycles in flatfish from the northwestern pacific,with particular reference to their early histories." Netherlands Journal of Sea Research. 29. 35-48 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] M.Tanaka: "Evidence for thymus involution in metamorphosing Japanese flounder(Paralichthys olivaceus)." Aquaculture. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] M.Tanaka: "Developmental changes in tissue concentrations of cortisol in metamorphosing Japanese flounder at different water temperatures." Nippon Suisan Gakkaishi. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] M.Tanaka: "Developmental changes in structure of the digestive system and activities of the digestive enzymes in metamorphosing Japanese flounder." Journal of Fish Biology. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] C.Chantanachookhin: "Comparative study of the ontogeny of the lymphoid in three species of marine fish." Aquaculture. 99. 143-155 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] M.Tanaka: "A thyroxine surge during development of black sea bream larvae and its ecological implication in inshore migration." Nippon Suisan Gakkaishi. 57. 1827-1832 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] R.Kimura: "Prolactin production during larval and early juvenile periods of euryhaline marine fish, black sea bream." Nippon Suisan Gakkaishi. 57. 1833-1837 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] R.Kimura: "Developmental changes in tissue thyroid hormone levels of red sea bream Pagrus major." Nippon Suisan Gakkaishi. 58. 975 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Seikai: "Process of pigment cell differentiation in skin on the left and right sides of the Japanese flounder during metamorphosis." Japanese Journal of Ichthyology. 39. 85-92 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Minami: "Life history cycles in flatfish from the northwestern Pacific, with particular reference to their early life histories." Netherlands Journal of Sea Research. 29. 35-48 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] M.Tanaka: "Evidence for thymus involution in metamorphosing Japanese flounder (Paralichthys olivaceous)." Aquaculture.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] M.Tanaka: "Developmental changes in tissue concentrations of cortisol in metamorphosing Japanese flounder at different temperatures." Nippon Suisan Gakkaishi.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] M.Tanaka: "Developmental changes in structure of the digestive system and activities of the digestive enzymes in metamorphosing flounder." Journal of Fish Biology.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] R.Kimura: "Developmental changes in tissue thyroid hormone levels of red sea bream Pagrus major" Nippon Suisan Gakkaishi. 58. 975- (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Seikai: "Process of pigment cell differentiation in skin on the left and right sides of the Japanese flounder during metamorphosis." Japanese Journal Ichthyology. 39. 85-92 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] M.Tanaka: "Developmental changes in tissue concentration of cortisol in metamorphosing Japanese flounder at different temperatures." Nippon Suisan Gakkaishi. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] M.Tanaka: "Developmental changes in structure of the digestive system and activities of the digestive enzymes in metamorphosing flounder." Journal of Fish Biology. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] C.Chantanachookhin: "Comparative study of the ontogeny of the Iymphoid in three species of marine fish" Aquaculture. 99. 143-155 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] M.Tanaka: "A thyroxine surge during development of black sea bream larvae and its ecological implication in inshore migration" Nippon Suisan Gakkaishi. 57. 1827-1832 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] R.Kimura: "Prolactin production during larval and early juvenile periods of euryhaline marine fish,black sea hream" Nippon Suisan Gakkaishi. 57. 1833-1837 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] M.Tanaka: "Euidence for thymus involution in metamorphosing Japanese flounder(Paralichtys olivaceus)" Aquaculture. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] M.Tanaka: "Thyroxine involvement in the spontaneous and induced metamorphosis of bambu sole (Heteromycteris japonicus)." Journal of Fish Biology.

    • Related Report
      1990 Annual Research Report
  • [Publications] M.Tanaka: "Changes in thyroid hormone and cortisol concentrations during metamorphosis of plaice (Pleuronectes platessa)." Journal of Fish Biology.

    • Related Report
      1990 Annual Research Report
  • [Publications] T.Seikai: "Asymmetrical differentiation of pigment cells in skin of the Japanese flounder,Paralichtys olivaceus,during metamorphosis." Japanese Journal of Ichthyology.

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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