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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).