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Fig. 4. Representative original recordings of heart rate (fH),
dorsal aortic pressure (Pda) and venous pressure
(Pven) from an untreated trout. Left-hand panels
demonstrate a pre-branchial occlusion (Pre) and right-hand panels demonstrate
a post-branchial occlusion (Post). Both occlusions are followed by a mean
circulatory filling pressure manoeuvre (MCFP).