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Fig. 2. Heart rate (A; fH) and mean circulatory filling
pressure (B; MCFP) in untreated, prazosin-treated (1 mg kg–1)
and atropine+prazosin treated trout (1 mg kg–1 and 1.2 mg
kg–1, respectively) during control conditions (white bars),
post-(grey bars) and pre-branchial occlusion (black bars). Control heart rate
represents pooled mean values + S.E.M. of 120 s prior to occlusion.
Heart rate during post- and pre-branchial occlusion are mean values +
S.E.M. of the last 20 s of the 30 s occlusion. MCFP is measured in
unstimulated fish and immediately following 30 s of stimulation with post- or
pre-branchial occlusion. Statistically significant difference *from
the control within each treatment and 
for control values
between treatments (Px0.05).
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