Fig. 7. Log-log plots of maximal peak negative buccal pressure (A) and maximal average buccal pressure (B) versus cranial length. These buccal pressures are averaged over the entire buccal cavity (from mouth aperture to pectoral fin) and were calculated with hydrodynamic models (Drost and van den Boogaert, 1986; Muller et al., 1982). Note that no significant changes were found for these pressures in relation to cranial size.