Fig. 11. Correlation between body kinematics and red muscle (RM) dynamics during steady swimming. (A) Dorsal midline traces from 0.4L to the tail tip (1.0L) for selected time intervals through one complete tailbeat cycle in an 87 cm L mako. Numbers indicate points in time as the tailbeat cycle progresses; dots indicate positions along the body (green is 0.6L, aqua is 1.0L) for which data are illustrated in B and C. (B) Lateral displacement (D) as a function of time for the tailbeat cycle shown in A. (C) Curvature (K) calculated at 0.6L (dotted line) superimposed on lateral displacement for 0.6L (solid line as in B) for the single tailbeat cycle. (D) RM strain for 0.4L (broken red line) and 0.6L (solid red line) on the left side of the body.