title: Rhythmic melatonin secretion in different teleost species: an in vitro study.
abstract: The rhythmic production of melatonin is governed by intrapineal oscillators in all fish species so far investigated except the rainbow trout. To determine whether the latter represents an exception among fish, we measured in vitro melatonin secretion in pineal organs of nine wild freshwater and six marine teleost species cultured at constant temperature and under different photic conditions. The results demonstrate that pineal organs of all species maintain a rhythmic secretion of melatonin under light:dark cycles and complete darkness, and strongly suggest that most fish possess endogenous intrapineal oscillators driving the rhythm of melatonin production, with the exception of the rainbow trout.
authors.affiliation: Département de Sciences Biologiques, Université de Montréal, Canada.
authors.forename: V
authors.initials: V
authors.lastname: Bolliet
authors.forename: M A
authors.initials: MA
authors.lastname: Ali
authors.forename: F J
authors.initials: FJ
authors.lastname: Lapointe
authors.forename: J
authors.initials: J
authors.lastname: Falcón
mesh_terms: D000818:Animals; D002940:Circadian Rhythm / Q000502:physiology; D003624:Darkness; D005399:Fishes / Q000502:physiology*; D005618:Fresh Water; D066298:In Vitro Techniques; D008027:Light; D008550:Melatonin / Q000378:metabolism*; D017686:Oncorhynchus mykiss / Q000502:physiology; D010507:Periodicity; D010870:Pineal Gland / Q000378:metabolism; D012623:Seawater; D013045:Species Specificity
chemical_list: D008550:Melatonin