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Fig. 3. Representative original recordings of dorsal aortic blood pressure
(Pda) from one trout before treatment (A) and after
prazosin (1 mg kg1) treatment (B). 30 s of pre-branchial
occlusion starts at a and stops at b followed by a mean
circulatory filling pressure manoeuvre between c and d.
White bars represent 10 s mean values + S.E.M. of
Pda prior to occlusion and black bars represent 10 s mean
values + S.E.M. of Pda immediately following
the mean circulatory filling pressure manoeuvre. *Statistically
significant difference (Px0.05) between values. Note the reflex
increase in pressure during occlusion and the following increase in pressure
in the untreated fish. After prazosin treatment this reflex response is
absent.