Fig. 7. Red muscle strain (solid line) measured by sonomicrometry superimposed onto predicted strain (open circles) calculated from midline curvature for five tailbeat cycles at three body positions, anterior (A), mid (B) and posterior (C), in a 94.5 cm leopard shark, to illustrate the similarity between values of predicted and measured strain. The phase of measured strain closely matched the phase of local midline curvature (open circles, right axis), and thus predicted strain at all body positions in all individuals examined.