Figure 7

An example trajectory of an adult zebrafish traced with LACE. (A) Top view of the trajectory. The body's pseudo-skeleton is plotted as a line every 50 ms. Time is color coded by the color-bar. Three segments of the trajectory were chosen for a close up representation in B. 1 and 3 depicts fast turns and 2 shows a phase of undulatory body wave propulsion. (B) Enlarged view of the three segments from A. The pseudo-skeleton is now plotted every 5 ms. Time is encoded by the color bar. (C–E) show quantification of the trajectory over time. The gray areas mark the time in which the 3 segments (subplot B) occurred. (C) Thrust velocity in m*s⁻¹. (D) is a YY-plot. The dark blue axis presents the yaw angle in degrees (shown in the same color). The light blue axis shows the yaw velocity in °*s⁻¹ (shown in the same color). (E) depicts the mean angle of the pseudo-skeleton parts to each other. If the pseudo-skeleton is a perfect line, the angle is 180° and should decrease the more the skeleton is bent.