Short-Term Serum Prolactin Concentrations in Goldfish (Carassius auratus) Subjected to Serial Sampling and Restraint

Abstract
Serum prolactin concentrations in serially sampled goldfish (Carassius auratus) did not vary significantly between 30 s and 3 min after initial capture. A marked decrease in prolactin concentration was noted 9-17 min after initial capture followed by a recovery at 30-48 min. Although there was a circadian variation in prolactin concentration, the pattern of response to capture and sampling did not vary significantly among the times tested.