2010 Fiscal Year Final Research Report
Physiological studies on transduction of tidal stimuli in the brain of a tropical wrasse
| Project/Area Number |
20380114
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
General fisheries
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| Research Institution | University of the Ryukyus |
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Principal Investigator |
TAKEMURA Akihiro University of the Ryukyus, 理学部, 教授 (40222103)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 潮汐 / 産卵 / ミツボシキュウセン / ドーパミン / 組織 / サンゴ礁 |
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| Research Abstract |
The aim of the present study was to clarify how tidal stimuli are transduced endogenous signals in order to repeat daily spawning at high tide. To gain insight into these issues, the involvement of monoamines in mediating endogenous day-night and tidal rhythms in the threespot wrasse, Halichoeres trimaculatus, were examined. DA activity increased during the day and decrease during the night for fish held under a natural photoperiod. Intraperitoneal injection of melatonin resulted in a significant reduction in DOPAC/DA. Furthermore, DOPAC/DA was significantly lower in fish held at 3 m compared to 0 m depth, suggesting that hydrostatic pressure influences DA metabolic rate. These results indicate that light and hydrostatic pressure control dopaminergic turnover in the brain of threespot wrasse. Day-night and tidal changes in these two factors therefore may be the main environmental cues the fish uses to synchronize its spawning activity.
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Research Products
(29 results)
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[Presentation] Molecular characterization of arginin vasotocin and its expression patterns in the threespot wrasse, Halicoeres trimaculatus.2009
Author(s)
Hur SP, Takeuchi Y, Park YJ, Jeong HB, Park JG, Song KS, Wambiji N, Kim SJ, Lee YD, Takemura A
Organizer
第7回東シナ海海洋学及び水産学に関する国際ワークショップ
Place of Presentation
上海海洋大学
Year and Date
20091204-20091205
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