Fig. 6. Graphical representation of the scaling of an expansive muscle in Clarias gariepinus. The mass (A) scales with significant positive allometry. Fibre lengths (B) increase with fish cranial length in accordance with the predictions of geometric similarity (slope not different from 1; see Table 3). The physiological cross-sectional area (C) also increases with significant positive allometry. The broken lines represent the expected slope under a model of geometric similarity (mass=3, length=1, cross-section=2). SH = m. sternohyoideus.