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Fig. 5. (A) Diagram of sound pulse generation progressing in time from top to
bottom. Contraction or pulling on the sonic muscle in a fresh specimen extends
the anterior bladder and swimbladder fenestra. In the third panel the hook has
disengaged from the bladder tubercle, and the system then snaps back to its
resting state generating sound. (B) Left lateral view of the anterior part of
the swimbladder. Blue arrows represent the amplitude of the displacement of
different points of the swimbladder fenestra when stretched.
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