Variations in Plasma Melatonin Levels of the Rainbow Trout (Oncorhynchus mykiss) under Various Light and Temperature Conditions(Endocrinology)
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概要
- 論文の詳細を見る
Daily variations in plasma melatonin levels in the rainbow trout Oncorhynchus mykiss were studied under various light and temperature conditions. Plasma melatonin levels were higher at mid-dark than those at mid-light under light-dark (LD) cycles. An acute exposure to darkness (2 hr) during the light phase significantly elevated the plasma melatonin to the level that is comparable with those at mid-dark, while an acute exposure to a light pulse (2 hr) during the dark phase significantly suppressed melatonin to the level that is comparable with those at mid-light. Plasma melatonin kept constantly high and low levels under constant darkness and constant light, respectively. No circadian rhythm was seen under both conditions. When the fish were subjected to simulative seasonal conditions (simulative (S)-spring: under LD 13.1:10.9 at 13℃; S-summer: under LD 14.3:9.7 at 16.5℃; S-autumn: under LD 11.3:12.7 at 13℃; S-winter: under LD 10.1:13.9 at 9℃), melatonin levels during the dark phase were significantly higher than those during the light phase irrespective of simulative seasons. The peak melatonin level in each simulative season significantly correlated with temperature but not with the length of the dark phase employed. In addition, the peak melatonin level in S-autumn was significantly higher than those in S-spring although water temperature was the same under these conditions. These results indicate that the melatonin rhythm in the trout plasma is not regulated by an endogenous circadian clock but by combination of photoperiod and water temperature.
- 2003-08-25
著者
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IIGO Masayuki
Department of Applied Biochemical Science, Faculty of Agriculture, Utsunomiya University
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AIDA KATSUMI
Graduate School of Agricultural and Life Sciences, The University of Tokyo
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Aida K
Department Of Aquatic Bioscience Graduate School Of Agricultural And Life Sciences University Of Tok
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Iigo M
Department Of Applied Biochemistry Faculty Of Agriculture Utsunomiya University
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Aida Katsumi
Laboratory of Aquatic Animal Physiology, Graduate School of Agricultural and Life Sciences, The Univ
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Tabata M
Department Of Animal Sciences Teikyo University Of Science And Technology
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Tabata Mitsuo
Department Of Biosciences Teikyo University Of Science And Technology
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Iigo Masayuki
Utsunomiya Univ. Tochigi Jpn
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Ichikawa M
Mie Univ. Mie Jpn
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Iigo Masayuki
Department Of Applied Biochemistry Faculty Of Agriculture Utsunomiya University
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Iigo Masayuki
Department Of Anatomy St. Marianna University School Of Medicine
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Aida Katsumi
Department Of Aquatic Bioscience Graduate School Of Agricultural And Sciences The University Of Toky
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Aida Katsumi
Department Of Aquatic Biosciences Graduate School Of Agricultural And Life Sciences The University O
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Tabata Mitsuo
Department Of Animal Sciences Teikyo University Of Science & Technology
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OISHI Tadashi
Graduate School of Humanities and Science, Nara Women's University
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Asahina K
Univ. Utrecht Utrecht Nld
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MASUDA Tomohiro
Johns Hopkins University School of Medicine
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Masuda Tomohiro
Laboratory of Aquatic Animal Physiology, Graduate School of Agricultural and Life Sciences, The Univ
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Mizusawa Kanta
Laboratory of Aquatic Animal Physiology, Graduate School of Agricultural and Life Sciences, The Univ
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Naruse Mayumi
Department of Animal Sciences, Teikyo University of Science and Technology
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Aida Katsumi
Laboratory Of Aquatic Animal Physiology Graduate School Of Agricultural And Life Sciences The Univer
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Oishi Tadashi
Graduate School Of Human Culture Nara Women's University
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Naruse Mayumi
Department Of Animal Sciences Teikyo University Of Science And Technology:graduate School Of Human C
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Mizusawa Kanta
School Of Fisheries Sciences Kitasato University
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Ichikawa M
Department Of Applied Biochemistry Utsunomiya University
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Aida K
Department Of Aquatic Bioscience Graduate School Of Agricultural And Life Sciences The University Of
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Iigo Masayuki
Department Of Biotechnology United Graduate School Of Agricultural Science Tokyo University Of Agric
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