Gingerich, W. H., and Drottar, K. R., 1989, Plasma catecholamine concentrations in rainbow trout (Salmo gairdneri) at rest and after anesthesia and surgery: General and Comparative Endrocrinology, v. 73, no. 3, p. 390-397. Abstract: The effects of surgery and anesthesia on concentrations of plasma epinephrine (E), norepinephrine (NE), and dopamine (DA) were investigated in rainbow trout (Salmo gairdneri ) fitted with dorsal aorta cannulae. Baseline catecholamines (CA) concentrations, established in resting rainbow trout, were 1.55 plus or minus 0.90 rho mol/ml (X plus or minus SD) for E, 2.07 plus or minus 1.26 for NE, and 1.33 plus or minus 0.87 for DA. After surgery, plasma concentrations of all CAs fell rapidly but values were still higher than baseline 6 hr after surgery, then were near baseline at 24 and 48 hr after surgery. Plasma E and NE concentrations in the fish during early anesthesia (1.14 plus or minus 0.14 min) were not significantly different from preanesthesia values. Keywords: blood, hormones, anaesthesia, biological-stress, steroids, fish-physiology, Salmo-gairdneri, serological-studies