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Fig. 3. Motion of lateral edge of left pelvic fin. The motion of each pelvic fin is
described as the change in angle of the fin's lateral edge with the
mid-sagittal plane and the transverse plane of the fish. The fin's lateral
edge is defined as the line between where the base of the most lateral pelvic
fin ray attaches to the body and the tip of the same lateral-most fin ray. (A)
Purple represents the fish's mid-sagittal plane; cyan represents the fish's
transverse plane. (B) Representative angles are labeled S (sagittal) and T
(transverse) to depict the angle measured. Black lines represent the left
pelvic fin lateral edge as it moved through its oscillating cycle over four
fin beats. (C) Plot of the three-dimensional motion of the lateral pelvic
fin-ray tip over one fin beat. Axes dimensions are the same as in B with all
units in cm and no temporal offset in the crainio-caudal axis. The circles
represent the start of fin stroke when the angle between the fin edge and the
transverse plane was minimal. The green line represents the three-dimensional
motion of the fin tip. Blue, cyan and black lines represent the motion of the
fin tip projected on the three axial planes.
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