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Fig. 2. Traces showing an example of a measurement of mean circulatory filling
pressure (MCFP) in a 250 g S. marmoratus ventilating its gills in
normoxic water (PO2>130 mmHg). PCV,
central venous pressure; PDA, dorsal aortic pressure. The
arrow indicates occlusion of blood flow from the heart to measure MCFP.
PCV after 1520 s of occlusion was taken as MCFP (1
cmH2O=0.098 kPa).