Evidence That Acute Stress Inhibits Ovarian Steroidogenesis in Rainbow Trout in Vivo, through the Action of Cortisol

Sexually mature (preovulatory) rainbow trout exposed to confinement stress showed a transitory increase in plasma cortisol levels that was accompanied by a similarly brief depression in plasma testosterone (T) levels. Plasma levels of maturational gonadotropin (GtH) and 17beta-estradiol (E(2)) were unaffected by stress. A similar pattern was displayed by fish exposed to stress in midvitellogenesis. Treatment of vitellogenic fish with exogenous …