Fig. 4. Secretion rates of adrenaline (filled columns) and noradrenaline (open
columns) in response to a bolus injection of saline (inset; N=6) or
biotinylated vasoactive intestinal polypeptide (VIP) (109
mol kg1; N=6) using an in situ posterior
cardinal vein preparation of rainbow trout. Values are shown as means ±
1 S.E.M. Asterisks denote a significant difference from the pre-stimulation
(Pre) value (P<0.05).