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Figure 5


Fig. 5. Traces showing the transition from gill ventilation to air-breathing in a 630 g S. marmoratus in hypoxic water (PO2≤50 mmHg). Arrow indicates the transition. PCV, central venous blood pressure; PDA, dorsal aortic blood pressure; Q, cardiac output; fH, heart rate (1 cmH2O=0.098 kPa).