Figure 1.

Oxygen consumption versus body mass for three species of teleost fishes. (a) Myoxocephalus scorpius; (b) Cyclopterus lumpus and (c) Macrozoarces americanus. For M. scorpius and C. lumpus, a biphasic analysis was performed to obtain estimates of both standard and maximal metabolic rates (MMRs; to account for the potential effects of early ontogeny on metabolic scaling), consisting of separate regressions before (‘premet’) and after (‘postmet’) the end of the metamorphic period (see §2 for description). A biphasic analysis was not performed for M. americanus because this species does not possess a larval period. Dashed lines represent estimates of scaling for standard and MMRs in M. scorpius and C. lumpus without attempting to account for ontogenetic effects (no biphasic analysis). Estimated in this manner, b_s in M. scorpius is 0.833 (s.e.m.=0.007; 95% confidence limits=0.818, 0.842), while b_m is 0.878 (s.e.m.=0.007; 95% CL=0.865, 0.891). Similarly, the combined estimate of b_s in C. lumpus is 0.844 (s.e.m.=0.005; 95% CL=0.837, 0.852), while b_m is 0.883 (s.e.m.=0.006; 95% CL=0.871, 0.894). For reference, theoretical representations of b=0.75 and 0.67 are also shown on the panel for (c) M. americanus. The filled circles represent maximal metabolic rate (MMR) and the open circles represent standard metabolic rate (SMR).