Changes in the pituitary metabolism of monoamines (dopamine, norepinephrine, and serotonin) in female and male rainbow trout (Oncorhynchus mykiss) during gonadal recrudescence.
The dynamics of the levels and metabolism of dopamine, norepinephrine, and serotonin were studied in pituitaries of male and female rainbow trout at different stages of gonadal development. In female rainbow trout, the turnover of dopamine (calculated using the inhibitor of tyrosine hydroxylase alpha-methyl-p-tyrosine methyl-ester HCl), serotonin metabolism, and norepinephrine levels decreased in the advanced stage of exogenous vitellogenesis with respect to the initial stage. However, data obtained in males did not show changes in either serotonergic or noradrenergic metabolism during the last stages of gonadal development. However, an increase of dopaminergic turnover was noticed in the male fish at the end of spermiation. Finally, pituitary dopaminergic activity was significantly higher in immature (prepubescent stage) than in adult fish.
Hernandez-Rauda
R
R
Laboratorio de Fisioloxía Animal, Departamento de Fisioloxía, Facultade de Bioloxía, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Galicia, Spain.
Rozas
G
G
Rey
P
P
Otero
J
J
Aldegunde
M
M
D000818:Animals; D004298:Dopamine / Q000378:metabolism*; D005260:Female; D006066:Gonads / Q000254:growth & development*; D008297:Male; D009638:Norepinephrine / Q000378:metabolism*; D017686:Oncorhynchus mykiss / Q000254:growth & development*; D010902:Pituitary Gland / Q000502:physiology*; D012701:Serotonin / Q000378:metabolism*; D013079:Sperm Maturation / Q000502:physiology; D014818:Vitellogenesis / Q000502:physiology
D012701:Serotonin; D004298:Dopamine; D009638:Norepinephrine