Relationship between active and standard rate of oxygen consumption (, μmol min–1) at 15°C and body mass (g) of brown trout from the four trials. Relationship between active and standard rate of oxygen consumption (, μmol min–1) at 15°C and body mass (g) of brown trout from the four trials. Red triangles, trial 1; blue circles, trial 2; green squares, trial 3; pink diamonds, trial 4. Data are presented on double logarithmic axes with fitted lines representing the power function , where a and b are constants and M is body mass. For log10-transformed regression equations, see Table 2. AMR, active metabolic rate; SMR, standard metabolic rate. Tommy Norin, and Hans Malte J Exp Biol 2011;214:1668-1675 © 2011.