Effects of Melatonin Feeding on Smoltification in Masu Salmon(Oncorhynchus masou)(Endocrinology)
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概要
- 論文の詳細を見る
Influences of photoperiod on plasma melatonin profiles and effects of melatonin administration on long-day-induced smoltification in masu salmon (Oncorhynchus masou) were investigated in order to reveal the roles of melatonin in the regulation of smoltification in salmonids. Under light-dark (LD) cycles, plasma melatonin levels exhibited daily variation, with higher values during the dark phase than during the light phase. The duration of nocturnal elevation under short photoperiod (LD 8:16) was longer than that under long photoperiod (LD 16:8). Melatonin feeding (0.01, 0.1 and 1 mg/kg body weight) elevated plasma levels of melatonin in a dose-dependent manner for at least 7 h but not for 24 h. When masu salmon reared under short photoperiod were exposed to long photoperiod (LD 16:8) and fed melatonin (1 mg/kg body weight) 7 hours before the onset of darkness, a significantly smaller proportion of smolts appeared in the melatonin-fed group after 32 days than in the control group. However, after 59 days of the treatment, there was no difference in the proportion of smolts between the control and melatonin-treated groups. Thus, melatonin feeding mimicked the effects of short photoperiod, which delays but does not completely suppress smoltification. These results indicate that the day length is transduced into changes in the duration of nocturnal elevation in plasma melatonin levels, and that artificial modification of the plasma melatonin pattern possibly delays the physiological processes of smoltification induced by long-day photoperiodic treatment.
- 2005-11-25
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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Kitamura S
Japan International Research Center For Agricultural Sciences
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Ikuta Kazumasa
Nikko Branch, National Research Institute of Aquaculture
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Kitamura Shoji
Nikko Branch, National Research Institute of Aquaculture
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Asahina K
Univ. Utrecht Utrecht Nld
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Aida Katsumi
Laboratory Of Aquatic Animal Physiology Graduate School Of Agricultural And Life Sciences The Univer
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Ikuta Kazumasa
Nikko Branch National Research Lnstitute Of Aquaculture
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Ikuta Kazumasa
Nikko Branch National Research Institute Of Aquaculture Japan Fisheries Agency
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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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