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Fig. 1. Fin and axial locomotion during slow swimming of the larval zebrafish. Fins
are actuated in alternating abduction–adduction cycles. The axial muscle
bends the body with the same frequency as the fins so that one axial cycle
corresponds to one abduction–adduction cycle of the fins. The timing of
fin abduction and adduction coincides with maximum axial bending. At 0 ms the
right fin is maximally abducted, ready to initiate adduction toward the body.
The left fin is in its adducted position against the body. At 10 ms
(mid-stroke), the right fin is adducting while the left is abducting. By 20 ms
the right fin is fully adducted while the left fin is at fully abducted. This
cycle is repeated with the right fin abducting forward and the left adducting
back.
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