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Fig. 5. Transitions between synchronous pectoral propulsion and axial propulsion.
(A) Video images showing axial propulsion (0.167-0.217 s) followed by
synchronous pectoral swimming with body held straight (0.267-0.3 s). (B)
Kinematics of synchronous pectoral rotation (blue and green), ceasing at about
0.15 s accompanied by two strokes of the caudal fin (red) and then pectoral
propulsion resuming at 0.25 s.