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Figure 2


Fig. 2. Relationship of (A) rate of oxygen consumption (MO2), (B) opercular ventilation rate (fG), (C) net aerobic cost of transport (NCOT), and (D) gross aerobic cost of transport (GCOT) as a function of swimming velocity (up to 2.3 BL s-1) for Seriola lalandi at 20°C and 25°C (symbols as in Fig. 1). In A, the slopes at the tangent to the curves from the origin (bold broken lines) are equal to the optimum swimming velocity (Uopt), which occurs where GCOT is at a minimum (GCOTmin) (illustrated by vertical dotted lines). In B, data have been binned into increments of 0.25 BL s-1 and symbols represent means ± s.e.m. (N=6, n=45).





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