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Fig. 9. Rate of oxygen consumption (O2; µmol min–1 kg–1) versus integrated (IP) and difference (DP) pressure (Pa) for six cod (Gadus morhua) at 5°C. Different symbols represent individual fish. (A) O2=23.4+0.469IP, r2=0.68, P<0.0001, N=52, where 23.4 µmol min–1 kg–1 is O2 at zero ‘integrated pressure’. (B) O2 versus maximum minus minimum pressure or ‘pressure difference’ (PD). O2=34.7+0.051PD, r2=0.43, P<0.0001, N=48, where 34.7 µmol min–1 kg–1 is O2 at zero pressure difference.