Involvement of environmental factors in relation to tropical monssoon in the reproductive activity of reef fishes
Project/Area Number |
25304032
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Partial Multi-year Fund |
Section | 海外学術 |
Research Field |
Aquatic life science
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Research Institution | University of the Ryukyus |
Principal Investigator |
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Project Period (FY) |
2013-04-01 – 2016-03-31
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Project Status |
Completed (Fiscal Year 2015)
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Budget Amount *help |
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2015: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2014: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2013: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
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Keywords | サンゴ礁 / 熱帯モンスーン気候 / アイゴ / 生殖 / 栄養 / インシュリン様成長因子 / 雨季 / フィリピン / フィリッピン / 月周性 / 性成熟 |
Outline of Final Research Achievements |
The aim of this study was to evaluate involvement of periodical changes in environmental factors in tropical waters in reproductive activity of reef fishes. When the goldlined spinefoot Siganus guttatus were collected monthly in Igan Bay, Guimaras Island, the Philippines, the gonadal activity of this species increased from March to July (rainy season). Individuals undergoing gonadal development were observed sporadically in any months. When experiments to check the effect of food availability on gonadal activity were carried out in dry season from September to October, gonadal development could be induced in all fish under experimental conditions. Abundance of insulin-like growth factor I (IGF-1) mRNA increased in the diencephalon of the fish with food limitation. These results suggest that in addition to water temperature and photoperiod, food availability becomes the possible environmental factor, which has a crucial impact on reproduction in tropical fishes.
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Report
(4 results)
Research Products
(18 results)
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[Journal Article] Existence of photoinducible phase for ovarian development and photoperiod-related alternation of clock gene expresssions in the sapphire devil, Chrysiptera cyanea.2015
Author(s)
Takeuchi, Y., Hada, N., Imamura, S., Bapary M.A.J., Hur, S.P., Bouchekioua, S. and Takemura, A.
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Journal Title
Comparative Biochemistry and Physiology
Volume: 188
Pages: 32-39
DOI
Related Report
Peer Reviewed / Acknowledgement Compliant
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[Journal Article] Environmental control of annual reproductive cycle and spawning rhythmicity of spinefoots2015
Author(s)
Takemura, A., Takeuchi, Y., Ikegami, T., Hur, S.P., Soliman, V., Ayson, F., de Jesus-Ayson, G., Sri Susilo, E.
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Journal Title
Kuroshio Science
Volume: 9
Pages: 31-38
NAID
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Journal Article] Influence of moonlight on mRNA expression patterns of melatonin receptor subtypes in the pineal organ of a tropical fish2014
Author(s)
Park, Y.J., Park, J.G., Takeuchi, Y., Hur, S.P., Lee, Y.D., Kim, S.J. and Takemura, A.
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Journal Title
Marine Genomics
Volume: 14
Pages: 67-70
DOI
Related Report
Peer Reviewed / Acknowledgement Compliant
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[Presentation] Physiological conditions alter expression pattern of insulin like growth factors in the brain and liver of the goldlined spinefoot (Siganus guttatus)2015
Author(s)
Miyagi, H., Yamauchi, C., Kabutomori, R., Udagawa, S., Takeuchi, Y., Okano, H. and Takemura, A.
Organizer
10th International Workshop on the Oceanography and Fishery Science in the East China Sea
Place of Presentation
Jeju Naitonal University
Year and Date
2015-11-02
Related Report
Int'l Joint Research
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