Fig. 4. (A) The relationship between swimming speed and O₂ uptake, and (B) between swimming speed and net cost of swimming (as O₂ uptake; see text for details), in normocapnic control eels (red symbols and regression line) and in eels exposed for at least 6 weeks to a water CO₂ partial pressure of 45±1 mmHg (blue symbols and regression line). In A, for control eels the relationship was described by the exponential equation y=2.85e^1.20x (r²=0.699, N=23 observations on six animals), whereas for eels exposed to hypercapnia the equation was y=2.94e^1.19x (r²=0.714, N=29 observations on seven animals). In B, for control eels the relationship was described by the power equation y=6.45x^1.50 (r²=0.755, N=23 observations on six animals), whereas for eels exposed to hypercapnia the relationship was described by the equation y=6.51x^1.70 (r²=0.739, N=29 observations on 7 animals).

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