Fig. 3. Representative turning sequences across zebrafish ontogeny showing movie frames near the start, midpoint and end (top, middle and bottom rows, respectively) of each turning sequence. The first frame shown from each sequence was selected as the one where the dominant point of rotation along the body was clearly visible. The last frame selected was the frame where the head had reached its final angular displacement and the body is nearly straight. Maximum body curvature, which was usually reached near the midpoint of the turn, is largest in larvae and smallest in adults. Linear velocity of fins is greatest in adult fish even though angular velocity of the head is smallest in adults. The most prominent center of rotation for routine turns remains over the pectoral girdles in all stages examined (top row); other areas of the body may also exhibit rotational motion.