Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/19637
Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Seasonal and daily plasma melatonin rhythms and reproduction in Senegal sole kept under natural photoperiod and natural or controlled water temperature
Authors: Vera, LM
Oliveira, Catarina
Lopez-Olmeda, Jose F
Ramos, Jesus
Mananos, Evaristo
Madrid, Juan Antonio
Sanchez-Vazquez, F Javier
Contact Email: luisa.veraandujar@stir.ac.uk
Keywords: melatonin rhythm
seasonal
Senegal sole
spawning
temperature
Issue Date: Aug-2007
Publisher: Wiley-Blackwell
Citation: Vera L, Oliveira C, Lopez-Olmeda JF, Ramos J, Mananos E, Madrid JA & Sanchez-Vazquez FJ (2007) Seasonal and daily plasma melatonin rhythms and reproduction in Senegal sole kept under natural photoperiod and natural or controlled water temperature, Journal of Pineal Research, 43 (1), pp. 50-55.
Abstract: The melatonin daily rhythm provides the organism with photoperiod-related information and represents a mechanism to transduce information concerning time of day. In addition, the duration and amplitude of the nocturnal elevation gives information about duration and thus the time of year. In this study, we investigate the existence of an annual rhythm of plasma melatonin in the Senegal sole. Differences in plasma melatonin levels between fish kept at a controlled temperature (17-20°C) and those exposed to the environmental temperature cycle (11.5-25°C) were also examined throughout the year. Spawning was registered in both groups to determine the time of year in which reproductive rhythms occurred. Our results pointed to the existence of an annual rhythm of plasma melatonin at mid-darkness (MD), with the highest levels (203 ± 44 pg/mL) observed when water temperature reached 25°C. Water temperature influenced nocturnal, but not diurnal melatonin. Daily melatonin rhythms showed seasonal differences, with higher mean nocturnal levels during the summer solstice (138 ± 19 pg/mL) and autumn equinox (149 ± 49 pg/mL). When animals were kept at a constant temperature throughout the year, plasma melatonin levels differed from those observed in fish exposed to the environmental temperature cycle. Regarding the reproductive rhythms, spawning was observed at the end of spring in sole kept under natural temperature conditions, whereas no spawning at all was registered in sole reared at a constant temperature. In short, both photoperiod and temperature affected melatonin production in the Senegal sole, transducing seasonal information and controlling annual reproductive rhythms.
Type: Journal Article
URI: http://hdl.handle.net/1893/19637
DOI Link: http://dx.doi.org/10.1111/j.1600-079X.2007.00442.x
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: Aquaculture
University of Murcia
University of Murcia
Spanish Council for Scientific Research
Spanish Council for Scientific Research
University of Murcia
University of Murcia

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