| Project/Area Number |
22658060
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
General fisheries
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| Research Institution | Kitasato University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
CHIBA Hiroaki 北里大学, 海洋生命科学部, 准教授 (50236816)
MIZUSAWA Kanta 北里大学, 海洋生命科学部, 講師 (70458743)
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥3,560,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2012: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2011: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2010: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | 水産学 / 生理学 / 光環境 / 海水適応 / 水・電解質代謝 / サクラマス / メラニン凝集ホルモン / メラニン凝集ホルモン受容体 / 背地色 / 白背地 / 黒背地 / 鰓 / Na+,K+-ATPase / 電解質 / 白色水槽 / in situハイブリダイゼーション法 / 免疫組織染色法 / 黒色素胞刺激ホルモン / MSH / メラノコルチン受容体 / MCR / 浸透圧調節 |
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| Research Abstract |
We previously found that masu salmon (Oncorhynchus masou) reared on a white background showed better seawater adaptability than those reared on a black background. Herein, we investigated the association of the hypothalamo-pituitary system, in which the production of hormones varies in response to background color changes, with seawater adaptability and electrolyte metabolism. The following important results were obtained. Firstly, rearing masu salmon on a white background resulted in a paler body color and an increase in the activity of Na+K+ATPase (NKA) in gills. Secondly, in vivo treatment with melanin-concentrating hormone, which is produced in the hypothalamus, increased gill NKA activity. Finally, expression of the melanin-concentrating hormone receptor gene was detected in the chloride cells in gills. These results suggest that background color influences osmoregulation in gills via melanin-concentrating hormone.
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