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Fig. 3. Sketches showing the measurement of the center of mass. (A,B) An
unconscious fish was carefully wrapped in nylon string and then suspended for
photography; the procedure was repeated several times with the string in
different positions each time. (C) The center of mass (CM; indicated by a
black-and-white checked circle) was located by determining the intersection of
any two extensions of the upright nylon strings from photographs.