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Fig. 4. A summary of the effects of unsteady (fighting and burst-and-coast) swimming behaviours on the venous blood oxygen partial pressure (PvO2). The minimum PvO2 observed at 100% critical swimming speed (Ucrit) was assigned a value, and the minimum PvO2 as a result of the unsteady swimming behaviour was expressed as a percentage. For clarity, only PvO2 values within 60% of the threshold are presented.