Figure 4.

The optimal swimming speed (U_opt) for minimum CoT between groups expressed as body lengths s⁻¹ (A), a percentage of the critical swimming speed (U_crit) (B) and in cm s⁻¹ versus the CoT (C). Statistical differences in (A) and (B) between fed and fasted fish across temperature are indicated with letters, and statistical differences between 9°C and 18°C within fed or fasted fish are indicated with asterisks. Vertical differences in U_opt in (C) are indicated with letters, while numbers indicate horizontal differences in CoT (two-way ANOVA with Hold–Sidak post-hoc analyses, P < 0.05). N = 3 and data are mean ± s.e.m.