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Studies on artificial control of reproductive cycle in fishes.

Research Project

Project/Area Number 63480068
Research Category

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

Allocation TypeSingle-year Grants
Research Field General fisheries
Research InstitutionFaculty of Agriculture, University of Tokyo

Principal Investigator

FURUKAWA Kiyoshi (1989)  Tokyo Univ. Fac. Ag. Res. Assoc., 農学部, 助手 (40134514)

羽生 功 (1988)  東京大学, 農学部, 教授 (20011835)

Co-Investigator(Kenkyū-buntansha) HANYU Isao  Tokyo Univ. Fac. Ag. Emer. Prof., 農学部, 名誉教授 (20011835)
SAKAI Kiyoshi  Tokyo Fish. Univ. Fac. Fish. Res. Assoc., 水産学部, 助手 (70017060)
AIDA Katsumi  Tokyo Univ. Fac. Ag. Prof., 農学部, 教授 (50012034)
古川 清  東京大学, 農学部, 助手 (40134514)
Project Period (FY) 1988 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥7,100,000 (Direct Cost: ¥7,100,000)
Fiscal Year 1989: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1988: ¥4,900,000 (Direct Cost: ¥4,900,000)
KeywordsHonmoroko / Tobinumeri-dragonet / Rainbowtrout / Goldfish / Gonadal maturation / Spawning / Photoperiodism / Gonadotropin / エストラジオ-ル / テストステロン
Research Abstract

1. The effects of water temperature and photoperiod on the reproductive activity were investigated in two fishes, freshwater cyprinid fish Honmoroko (Gnathopogon caerulescens) and seawater dragonet Tobinumeri (Repomucenus beniteguri), as new species. (1) Honmoroko showed a similar response with goldfish to environmental factors, that is, photoperiodism was dependent on temperature and high temperature suppressed gonadal maturation. Short daylength depressed maturation more effectively as water temperature increased. In autumn when temperature decreased, gonadal recrudescence started with the diminution of inhibitory effect of short daylength. Though maintenance of maturation needed long photoperiod in the spawning season of spring to early summer,high temperature in summer suppressed the gonadal activity when daylength was still long. (2) Tobinumeri began to spawn as temperature rose (above 18゚C) in spring, and stopped spawning temporally with further rise of temperature (above 28゚C). … More Spawning resumed with the fall of temperature in autumn (below 24-25゚C), and spawning continued below 14゚C. It was noticed experimentally that unlike honmoroko, long photoperiod had suppressive effect on gonadal activity in this fish.
2. Rainbowtrout broodstock were reared under long photoperiods, 16L, 18L and 20L for about one year from March. Gonadal recrudescence advanced under long daylength, and at 16L females reached spawning peak in October whereas the peak of other groups were November. The spermiation of males of three groups started one month earlier than those of natural condition group. It was suggested that long photoperiod treatment can compensate the delay of male maturation which is a problem of many hatcheries where early spawning females have been selected.
3 Two experiments were conducted with goldfish. One was long term exposure to 24゚C or 16゚C combined with 16L or 12L, and the other was short exposure to four regimes transferred from natural condition several times in a year. These experiments revealed that photoperiodism became clearer as temperature increased, but enhancement of gonadal maturation by long photoperiod was transient. It was also observed that high temperature and long photoperiod was suppressive to gonads in female but not in male.
4. As to the plasma level of maturation related hormones in honmoroko and goldfish, estradiol-17beta of female fish and testosterone of male fish were correlated with degree of gonadal maturation but gonadotropin contents increased with the temperature regardless of maturational stage. Less

Report

(3 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] Razani H.,Hanyu I.,Aida K.: "Environmental influences on ovarian activity and related hormones in yearling goldfish" Nippon Suisai Gakkaishi. 54. 1505-1511 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Razani H.,Hanyu I.,and Aida K.: "Environmental influences on testicular activity and related hormones in yearling goldfish" Nippon Suisai Gakkaishi. 54. 1513-1520 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Okuzawa K.,Furukawa K.,Aida K.,and Hanyu I.: "Effects of photoperiod and temperature on gonadal maturation,and plasma steroid and gonadotropin levels in a Cyprinid fish,the honmoroko Gnathopogon caerulescens." Gen.Comp.Endocrinol.75. 139-147 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Zhu Y.,Furukawa K.,Aida K.,and Hanyu I.: "Annual reproductive rhythm of the tobinumeri-dragonet Repomucenus beniteguri(Callionymidae)in lake Hamana." NIppon Suisan Gakkaishi. 55. 591-599 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Razani H.,Hanyu I.,Aida K.,and Furukawa K.: "Rematuration of female goldfish under continued warm or cool tempetature in combination with short or long photoperiod." Nippon Suisan Gakkaishi. 55. 1499-1504 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Razani H.,Hanyu I.,Aida K.,and Furukawa K.: "Rematuration of male goldfish under continued warm or cool tempetature in combination with short or long photoperiod." Nippon Suisan Gakkaishi. 55. 1515-1510 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Razani H., Hanyu I., Aida K.: "Environmental influences on ovarian activity and related hormones in yearling goldfish." Nippon Suisai Gakkaishi 54:1505-1511, 1988.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Razani H., Hanyu I., Aida K.: "Environmental influences on testicular activity and related hormones in yearling goldfish." Nippon Suisai Gakkaishi 54:1513-1520, 1988.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Okuzawa K., Furukawa K., Aida K., and Hanyu I.: "Effects of photoperiod and temperature on gonadal maturation, and plasma steroid and gonadotropin levels in a Cyprinid fish, the honmoroko Gnathopogon caerulescens." Gen. Comp. Endocrinol. 75:139-147, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Zhu Y., Furukawa K., Aida K., and Hanyu I.: "Annual reproductive rhythm of the tobinumeri- dragonet Repomucenus beniteguri (Callionymidae) in lake Hamana." Nippon Suisan Gakkaishi 55:591-599, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Razani H., Hanyu I., Aida K., and Furukawa K.: "Rematuratin of female goldfish under continued warm or cool temperature in combination with short or long photoperiod." Nippon Suisan Gakkaishi 55:1499-504, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Razani H., Hanyu I., Aida K., and Furukawa K.: "Rematuration of male goldfish under continued warm or cool temperature in combination with short or long photoperiod." Nippon Suisan Gakkaishi 55:1515-1510, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Zhu Y., Furukawa K., Aida K., and Hanyu I.: "Daily spawning rhythm during spring and autumn spawning seasons in the tobinumeri-dragonet, Repomucenus beniteguri." Nippon Suisan Gakkaishi.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Yong Z.,Furukawa K.,Aida K.,Hanyu I.: "Annual reproductive rhythm of the tobinumeri-dragonet Repomucenus beniteguri(Callionymidae)in lake Hamana" Nippon Suisan Gakkaishi. 55. 591-599 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Razani H.,Hanyu I.,Aida K,Furukawa K.: "Rematuration of female goldfish under continued warm or cool temperature in combination with short or long photoperiod." Nipppon Suisan Gakkaishi. 55. 1499-1504 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Razani H.,Hanyu I.,Aida K.,Furukawa K.: "Rematuration of male goldfish under continued warm or cool temperature in combination with short or long photoperiod." Nippon Suisan Gakkaishi. 55. 1505-1510 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Yong Z.,Furukawa K.,Aida K.,Hanyu I.: "Daily Spawning rhythm during spring and antumn spawning seasons in the tobinumeri-dragonet,Repomucenus beniteguri" 日水誌.

    • Related Report
      1989 Annual Research Report
  • [Publications] Okuzawa K;Furukawa K;Aida K;Hanyu I: Gen Amp.Endocrinol. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] Ragani H;Hanyu I;Aida K: 日水誌. 54. 1505-1511 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Ragani H;Hanyu I;Aide K: 日水誌. 54. 1513-1520 (1988)

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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