Involvement of environmental factors in relation to tropical monssoon in the reproductive activity of reef fishes

• Project/Area Number: 25304032
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 海外学術
• Research Field: Aquatic life science
• Research Institution: University of the Ryukyus
• Principal Investigator: Takemura Akihiro 琉球大学, 理学部, 教授 (40222103)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥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)
• 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.

Research Products

• [Int'l Joint Research] SEAFDEC/AQD(フィリピン)
• [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.
  • Journal Title: Comparative Biochemistry and Physiology Volume: 188 Pages: 32-39
  • DOI: 10.1016/j.cbpa.2015.06.010
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Environmental control of annual reproductive cycle and spawning rhythmicity of spinefoots (2015)
  • Author(s): Takemura, A., Takeuchi, Y., Ikegami, T., Hur, S.P., Soliman, V., Ayson, F., de Jesus-Ayson, G., Sri Susilo, E.
  • Journal Title: Kuroshio Science Volume: 9 Pages: 31-38
  • NAID: 120005947560
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Influence of moonlight on mRNA expression patterns of melatonin receptor subtypes in the pineal organ of a tropical fish (2014)
  • Author(s): Park, Y.J., Park, J.G., Takeuchi, Y., Hur, S.P., Lee, Y.D., Kim, S.J. and Takemura, A.
  • Journal Title: Marine Genomics Volume: 14 Pages: 67-70
  • DOI: 10.1016/j.margen.2013.10.006
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Impacts of moonlight on fish reproduction (2014)
  • Author(s): Ikegami T, Takeuchi Y, Hur SP, Takemura A
  • Journal Title: Marine Genomics Volume: (印刷中) Pages: 59-66
  • DOI: 10.1016/j.margen.2013.11.007
  • Peer Reviewed
• [Presentation] 外部環境要因変動がゴマアイゴの脳と肝臓におけるインシュリン様成長因子遺伝子発現に与える影響 (2016)
  • Author(s): 宮城ひとみ・山内千裕・兜森諒・竹内悠記・岡野俊行・竹村明洋
  • Organizer: 平成28年度日本水産学会春季大会
  • Place of Presentation: 東京海洋大学
  • Year and Date: 2016-03-26
• [Presentation] Growth in darkness in the tropical spinefoot: a possible role in the somatic endocrine axis (2015)
  • Author(s): Yamauchi, C., Miyagi, H., Morita, M. 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
  • Int'l Joint Research
• [Presentation] Lunar phase-dependent expression of clock genes in the brain of the Malabar grouper, Epinephelus malabaricus (2015)
  • Author(s): Yamashina, F., Fukunaga, K., Takeuchi, Y. 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
  • Int'l Joint Research
• [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
  • Int'l Joint Research
• [Presentation] Sequence and expression of clock genes in the honeycomb grouper (2015)
  • Author(s): Fukunaga, K., Nishihata, Y., Yamashina, F., Takeuchi, Y. 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
  • Int'l Joint Research
• [Presentation] フィリピンギマラス島イガン湾に生息するゴマアイゴの生殖年周期 (2015)
  • Author(s): 中谷 悟・竹村明洋・Ayson, F.・De Jesus Grace, E.
  • Organizer: 沖縄魚類研究交流会
  • Place of Presentation: 名護青年の家
  • Year and Date: 2015-02-28 – 2015-03-01
• [Presentation] Lunar impact on spawning rhythmicity in tropical fishes and its application to the management of fisheries resources (2014)
  • Author(s): Takemura, A., Soliman, V., Ayson F., De Jesus Grace, E., Sri Susilo, E.
  • Organizer: 8th International Symposium on Kuroshio Science
  • Place of Presentation: Asakura Campus, Kochi University
  • Year and Date: 2014-09-13
  • Invited
• [Presentation] サンゴ礁生物の環境応答と生物時計 (2014)
  • Author(s): 竹村明洋・池上太郎・竹内悠記
  • Organizer: 九州山口リズム研究会
  • Place of Presentation: 九州大学大橋キャンパス（福岡県）
• [Presentation] 光で操るサンゴ礁性魚類の成熟と成長
  • Author(s): 竹村明洋
  • Organizer: 平成25年度亜熱帯性動植物に関する調査研究・技術開発研究会
  • Place of Presentation: 沖縄県男女共同参画センターてぃるる（沖縄県）
• [Book] Circannual and Circatidal Rhythms: Patterns and Mechanisms of Nature’s Enigmatic Clocks (2015)
  • Author(s): Ikegami, T., Takeuchi, Y. and Takemura, A.
  • Total Pages: 360
  • Publisher: Springer
• [Remarks] Welcome to Takemura's laboratory
  • URL: http://www.takemura-lab.jp
• [Remarks] Homepage of Takemura-lab
  • URL: http://www.takemura-lab.jp
• [Remarks] Homepage of Takemura-lab
  • URL: http://www.takemura-lab.jp