Steroid aromatase, 2-hydroxylase and COMT activity in gonadotropic cells of the African catfish, Clarias gariepinus

In many teleost species, including the African catfish, gonadotropin (GTH) secretion is subject to a gonadotropin-releasing hormone (GnRH) stimulation. Besides this GnRH stimulation a dopaminergic inhibition has been demonstrated. Dopamine acts indirectly by blocking the GnRH-induced GTH release.