Fig. 2. Longitudinal distribution of the red, aerobic locomotor muscle (RM) for the three thresher shark species. (A) bigeye thresher, A. superciliosus (N=3), (B) pelagic thresher, A. pelagicus (N=3), (C) common thresher, A. vulpinus (N=6; modified from Bernal et al., 2003). Gray-shaded bar indicates the body section where maximum RM (shown in red) is found. Yellow represents the vertebral column. The relative amounts of RM in the different positions along the body are expressed as a proportion of the RM cross-sectional area equal to 1 at 50% fork length (see Table 1 for RM cross-sectional area at 50% FL). Values shown are means ± S.E.M.