Fig. 5. Graphical representation of the scaling of a jaw closing muscle in Clarias gariepinus. Although the mass of the muscle (A) scales with the expected slope of 3, the fibre length (B) scales with significant negative allometry (Table 3). Thus, the physiological cross-section (C) scales with significant positive allometry. The broken lines represent the expected slope under a model of geometric similarity (mass=3, length=1, cross-section=2).