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ISSUE 2, 1987 AGE ESTIMATION FOR RAZORBACK SUCKER <br />A <br />C <br />E <br />G <br />max. <br />a <br />89 <br />Figure 1. Structures from a razorback sucker 34 years old by otolith section caught from Lake Mohave, Arizona and Nevada <br />(A, C, E, and G), and a 3-year-old, hatchery-produced, pond-reared specimen from DNFH (B, D, F, and H). Each dot on <br />structures of the older fish represents 10 presumed annular growth marks, and each on the younger a single such mark. <br />A-B, cleithra; C-D, opercula; E-F, branchiostegal rays; and G-H, thoracic vertebrae (scales (lower right, each photo] A-D <br />= 1.0 cm, E-H = 0.5 cm).