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Fig. 1. Endoscopic images (right panels) and synchronized external images (left
panels) digitized from DVCAM videotapes recorded at 125 Hz. The anterior of
the fish is at the bottom of the endoscopic view, and at the right of the
external view. The cannula through which the endoscope is inserted can be seen
at the upper left of the external view. (A) Prior to the next feeding pump,
food is introduced in front of the oral jaws through a tube. The second
branchial arch (cb II) and the tips of two lateral rakers (r) on cb II are
visible in the endoscopic view. These raker tips are approximately 0.2 mm
wide. (B) The oral jaws have abducted, and food particles can be seen passing
through the endoscopic field of view. (C) As stage 1 of a reversal begins, a
mucus aggregate (m) is seen resting on the second and third branchial arches.
(D) As stage 2 of a reversal clears mucus from the field of view, the row of
lateral gill rakers (r) is visible on ceratobranchial III (cb III).
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