Effect of photoperiod manipulation on the daily rhythms of melatonin and reproductive hormones in caged European sea bass
The aim of the present research was to investigate the effects of photoperiod manipulation on daily rhythms of melatonin and reproductive hormones (pituitary and plasma LH, testosterone [T] and 11-ketotestosterone [11KT]) in juvenile sea bass, kept in net cages under farming conditions in winter.
M.J. Bayarri1, L. Rodríguez2, S. Zanuy2, J.A. Madrid1, F.J. Sánchez-Vázquez1 and M. Carrillo2
(1) Department of Physiology, Faculty of Biology, 30100 Murcia, Spain
(2) Department of Fish Reproductive Physiology, IATS, CSIC, 12595 Castellón, Spain
Abstract
There are few studies regarding the daily changes in reproductive hormone profiles in teleosts. The aim of the present research was to investigate the effects of photoperiod manipulation on daily rhythms of melatonin and reproductive hormones (pituitary and plasma LH, testosterone [T] and 11-ketotestosterone [11KT]) in juvenile sea bass, kept in net cages under farming conditions in winter. Our results provide the first evidence for the presence of daily variations in pituitary and plasma LH and plasma T in sea bass. Artificial lights suppressed circulating plasma melatonin levels and significantly affected the daily rhythm of LH storage and release.
Effect of photoperiod manipulation on the daily rhythms of melatonin and reproductive hormones in caged European sea bass (full article)