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Fig. 6. Tailbeat frequency versus swimming speed for seven cod (Gadus morhua) fitted with pressure sensors and two cod without instrumentation (filled circles) swimming in a ‘Brett-style’ respirometer at 5°C. fTB=22.73+97.08U, r2=0.85, P<0.0001, N=144; where fTB is tailbeat frequency in beats min–1 and U is swimming speed in m s–1.