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Figure 6


Fig. 6. Acceleration and braking maneuver. Muscle activity is shown for the left supracarinalis (SC), hypochordal longitudinalis (HL), flexor dorsalis (FD), interradialis (IR) designated by its number (6, 9, 12) of dorsally corresponding fin ray, flexor ventralis (FV) and infracarinalis (IC) and right red axial myomere of the caudal peduncle (RED). Yellow tail outlines in the images above closely follow the distal margin of the caudal fin and fin ray position. Yellow arrows indicate the major direction of tail lobe movement. Images are of acceleration towards the prey item (A), flaring and cessation of lateral motion of the caudal fin (B), contralateral movement of the ventral lobe (C), dorsal and ventral lobes moving in the opposite direction (D), `S'-shaped caudal fin when forward movement of fish stops (E) and preparation to begin swimming again (F). Bar (yellow), 2 cm.





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