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Fig. 6. Magnitude of kinematic variables for body and fins during steady swimming.
Green bars represent the left fin and red bars represent the right fin. Body
and fins moved symmetrically around the midline of the fish [excursion to the
left (cm)=excursion to the right (cm), P>0.07]. Fin excursions
(body motion subtracted) were larger than body excursions (P=0.0011).
For all remaining variables, maximum values were significantly larger than
minimum values for each fin (P<0.0001). Right and left fins did
not differ in fin area, fin or body velocity (black bars), or fin angle with
the transverse plane (P>0.05). Left and right fins did differ in
angle with the sagittal plane; right fins had larger pronation angles than
left fins (P=0.0001). Large angles (rad) represent fin
adduction/supination and small angles represent fin abduction/pronation.
Asterisks above the bars denote significantly different values within fins
(P<0.0001). Asterisks below the bars denote significantly
different values between fins (P<0.001). Fin excursion, fin area
and fin angle with the sagittal plane had significant interaction between fish
and fin (P<0.0001). The subtle variation in these variables
between animals suggests a fine-tuned adjustment of fin area and kinematics to
maintain a steady gait.
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