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1989 Fiscal Year Final Research Report Summary

CONTROL OF THYROID HORMONE SECRETION IN SALMONIDS

Research Project

Project/Area Number 62480022
Research Category

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

Allocation TypeSingle-year Grants
Research Field 動物形態・分類学
Research InstitutionThe University of Tokyo

Principal Investigator

HIRANO Tetsuya  OCEAN RES. INST., UNIV. TOKYO PROFESSOR, 海洋研究所, 教授 (70013571)

Co-Investigator(Kenkyū-buntansha) IWATA Munehico  OCEAN RES. INST., UNIV. TOKYO ASSIST. PROFESSOR, 海洋研究所大槌臨界センター, 助手 (20090475)
KAWAUCHI Hiroshi  SCH. FISH., KITASATO UNIV. PROFESSOR, 水産学部, 教授 (70050523)
Project Period (FY) 1987 – 1989
KeywordsSalmon / Trout / Thyroid Gland / Thyroid Hormones / Thyroxine / Triiodothyronine / Migration / Early Development
Research Abstract

Thyroid hormones have been implicated in migration of salmonids, particularly in their downstream migration associated with smoltification. In this study, a method has been established to extract thyroid hormones, thyroxine and triiodothyronine, from the.egg and whole embryo and to quantify by radioimmunoassays. Thyroid hormones were contained in the yolk of unfertilized eggs of not only salmonids but also of all teleost species so far examined. In chum salmon and rainbow trout, the hormone concentrations decreased gradually until hatching, and then rapidly during yolk absorption.
The tissue and plasma levels of the hormones increased during emergence of chum salmon fry from the gravel bed, just before downstream migration.
No such increase was seen in non-migratory rainbow trout. A significant increase in the plasma levels of thyroxine was observed in the chum salmon fry as well as in amago salmon during downstream migration. A marked increase in the tissue levels of the thyroid hormones was also observed during metamorphic climax of the flounder larvae. Corticosteroid, cortisol, was also contained ih the salmon eggs, and changes in its concentrations were more or less in parallel with those in the thyroid hormones. The hormones seem to play important roles during early development of fishes, especially in association with migration and metamorphosis.

  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] Tagawa,M.et al.: "Presence of thyroxine in eggs and changes in its content during early development of chum salmon,Oncorhynchus keta." General and Comparative Endocrinology. 68. 129-135 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Iwata,M.et al.: "Inocorsistent effect of thyroid hormone alteration on seawater adaptability of fry of chum salmon,Oncorhynchus keta." Nippon Suisan Gakkaishi. 53. 1969-1973 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Miwa,S.et al.: "Thyroxine surge in metamorphosing flounder larvae." General and Comparative Endocrinology. 70. 158-163 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Inui,Y.et al.: "Changes in tissue thyroxine level of metamorphosing flounder Paralichthys olivaceus reared at different temperature" Nippon Suisan Gakkaishi. 55. 485-490 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tagawa,M.et al.: "Changes in tissue and blood concentrations of thyroid hormones in developing chum salmon." General and Comparative Endocrinology. 76. 437-443 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Iwata,M.et al.: "Effects of thyroid hormones on phototaxis of chum and coho salmon juveniles." Aquaculture. 82. 329-338 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hasegawa, S., T. Hirano, T. Ogasawara, M. Iwata, T. Akiyama and S. Arai: "Osmoregulatory ability of chum salmon, Oncorhynchus keta, reared in fresh water for prolonged periods." Fish Physiology & Biochemistry 4, 101-110, 1987.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tagawa, M. and T. Hirano: "Presence of thyroxine in eggs and changes in its content during early development of chum salmon, Oncorhynchus keta." General & Comparative Endocrinology 68, 129-135, 1987.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Iwata, M., S. Komatsu, S. Hasegawa, T. Ogasawara and T. Hirano: "Inconsistent effect of thyroid hormone alteration on seawater adaptability of the chum salmon, Oncorhynchus keta." Nippon Suisan Gakkaishi 53, 1969-1973, 1987.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Miwa, S., M. Tagawa, Y. Inui and T. Hirano: "Thyroxine surge in metamorphosing flounder larvae." General & Comparative Endocrinology 70, 158-163, 1988.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tanangonan, J.B., M. Tagawa, M. Tanaka and T. Hirano: "Changes in tissue thyroxine level of metamorphosing flounder Paralichthys olivaceus reared at different temperatures." Nippon Suisan Gakkaishi 55, 485-490, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ogasawara, T., T. Hirano, T. Akiyama, S. Arai, and T. Tagawa: "Changes in plasma prolactin and growth hormone concentration during freshwater adaptation of juvenile chum salmon (Oncorhynchus keta) reared in seawater for a prolonged period." Fish Physiology & Biochemistry 7, 309-313, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Inui, Y., M. Tagawa, S. Miwa and T. Hirano: "Effects of bovine TSH in prometamorphic flounder larvae on the tissue thyroxine level and metamorphosis." General & Comparative Endocrinology 74, 406-410, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tagawa, M. and T. Hirano: "Changes in tissue thyroxine level and metamorphosis." General & Comparative Endocrinology 76, 437-443, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Iwata, M., Yamanome, M. Tagawa, H. Ida and T. Hirano: "Effects of thyroid hormones on phototaxis of chum and chol salmon juveniles." Aquaculture 82, 329-338, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tagawa, M., Mswa, Y. Inui, E.G. de Jesus and T. Hirano: "Changes in thyroid hormone concentrations during early development and metamorphosis of the flounder, Paralichthys olivaceus." Zoological Science 1990.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] de Jesus, E.G., Y. Inui and T. Hirano: "Cortisol enhances the stimulating action of thyroid hormones on dorsal fin-ray resorption of the flounder larvae in vitro." General & Comparative Endocrinology 1990.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Fujioka, Y., S. Fushiki, M. Tagawa, T. Ogasawara, and T. Hirano: "Seasonal changes in plasma thyroxine levels in biwa and amago salmon reared in the pond." Nippon Suisan Gakkaishi 1990.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tagawa, M., M. Tanaka, S. Matsumoto and T. Hirano: "Thyroid hormones in eggs of various freshwater, marine and diadromous teleosts and their changes during embryonic development." Fish Physiology & Biochemistry 1990.

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

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Published: 1993-03-26  

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