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Open Access item Impact of photoperiod manipulation on day/night changes in melatonin, sex steroids and vitellogenin plasma levels and spawning rhythms in Senegal sole, Solea senegalensis

Other Titles:Photoperiod effect on reproduction rhythms in sole
Authors:Oliveira, Catarina R.
Mañanós, Evaristo L.
Ramos, Jesús
Sánchez-Vázquez, F. J.
Keywords:Melatonin, Photoperiod, Sex steroids, Solea senegalensis, Spawning, Vitellogenin
Issue Date:Jul-2011
Citation:Comparative Biochemistry and Physiology - A - Molecular and Integrative Physiology 159(3): 291-295 (2011)
Abstract:Photoperiod and temperature are known as the main synchronizers of seasonal reproduction in fish. This paper studied the role of photoperiod on the synchronization of F1 Senegal sole reproduction rhythms. Fish were maintained under constant short-photoperiod (9L:15D) from the winter solstice onwards (experimental group) or under naturally-changing photoperiod (control group), and water temperature naturally oscillated in both groups. Blood samples were collected during the reproduction season at pre-spawning (March), spawning (April) and post-spawning (May) to determine the endocrine status. Spawning events and egg quality parameters were also monitored. The results revealed a significant increase in nocturnal melatonin concentration from March to May in the control group, while in the experimental group such seasonal change did not occur. As to plasma levels of vitellogenin, testosterone, estradiol and 11keto-testosterone, differences between groups were found mostly in March, while in April and May levels were often similar. Spawning was observed in both groups, although the experimental group started slightly earlier and also finished earlier than the control group, perhaps as a result of the increase in sex steroids and VTG observed at pre-spawning. Briefly, reproduction rhythms persisted in the absence of the natural lengthening of photoperiod, although photoperiod manipulation altered the seasonal modulation of melatonin, increased sex steroids and vitellogenin at pre-spawning, and slightly advanced the timing of spawning.
Description:18 p., 5 figures, 1 table and references
Publisher version (URL):http://dx.doi.org/10.1016/j.cbpa.2011.03.025
Appears in Collections:(IATS) Artículos

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