Abstract
Intravenous injections of arginine vasopressin (AVP), arginine vasotocin (AVT), and isotocin (IST) produced dose-dependent increments in circulating levels of plasma cortisol in goldfish in which endogenous ACTH secretion was suppressed by prior administration of dexamethasone. Injections of met 5-enkephalin (ENK) or saline had no significant effect on plasma cortisol in dexamethasone-blocked fish. These results demonstrate that AVT and IST stimulate cortisol secretion in the goldfish and suggest that in teleosts AVT and IST possess corticotrophin-releasing factor (CRF) activity.
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