2015 Fiscal Year Final Research Report
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 |
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| Section | 海外学術 |
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| Research Field |
Aquatic life science
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| Research Institution | University of the Ryukyus |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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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 |
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| 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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| Free Research Field |
魚類生理学
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