Fig. 5. Relationship between average tailbeat amplitude and swimming speed for two cod (cod₁ and cod₂) (Gadus morhua) swimming in a ‘Brett-style’ respirometer at 5°C. Amplitude was measured at the tip of the caudal fin (C_amp) and at the position of the pressure sensor (S_amp). Filled squares, cod₁ (0.58 m), S_amp=10.84+8.56log₁₀U, r²=0.95, N=201, P<0.0001; open squares, cod₁ (0.58 m), C_amp=12.73+4.51log₁₀U, r²=0.58, N=158, P<0.0001; filled circles, cod₂ (0.68 m), S_amp=11.84+6.32log₁₀U, r²=0.86, N=235, P<0.0001; open circles, cod₂ (0.68 m), C_amp=14.84+5.75log₁₀U, r²=0.68, N=189, P<0.0001; where U is swimming speed in m s^–1. Values are means ± S.E.M.

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