title: Ontogenesis of diurnal rhythms of cAMP concentration, outer segment disc shedding and retinomotor movements in the eye of the brown trout, Salmo trutta.
abstract: Histological analyses of the retina of Salmo trutta post-embryos exhibit rhythmic disc shedding at 6 weeks, followed by cyclic retinomotor movements at 7 weeks. Diurnal variations in cAMP concentration, as established by a radioreceptor assay, develop simultaneously with retinomotor movements and are fully expressed at 9.5 weeks. In continuous darkness, neither retinomotor movements nor intra-ocular peaks of cAMP occur, indicating that the endogenous oscillator for retinomotor movements and cAMP levels is not yet developed.
authors.affiliation: Department of Zoology, University College Dublin, Ireland.
authors.forename: C A
authors.initials: CA
authors.lastname: McCormack
authors.forename: T J
authors.initials: TJ
authors.lastname: Hayden
authors.forename: Y W
authors.initials: YW
authors.lastname: Kunz
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D000242:Cyclic AMP / Q000502:physiology*; D003623:Dark Adaptation / Q000502:physiology; D008027:Light; D008543:Melanins / Q000502:physiology; D008675:Metamorphosis, Biological; D010588:Phagosomes / Q000502:physiology; D010786:Photoreceptor Cells / Q000166:cytology*; D010857:Pigment Epithelium of Eye / Q000166:cytology*; D012160:Retina / Q000166:cytology*; D012374:Rod Cell Outer Segment / Q000166:cytology*; D012487:Salmonidae / Q000254:growth & development*; D014337:Trout / Q000254:growth & development*; D014796:Visual Perception / Q000502:physiology*
chemical_list: D008543:Melanins; D000242:Cyclic AMP