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92 <br />A <br /> <br />JOURNAL OF THE ARIZONA-NEVADA ACADEMY OF SCIENCE <br />D <br />VOL. 21 <br />Figure 4. A. Diagrammatic illustration of sectioned sagitta of a razorback sucker 34 years old by otolith section caught <br />from Lake Mohave, Arizona and Nevada (scale, mm). B. Photograph of the enclosed section of A, showing presumed <br />annular marks (70X). C. Photograph (30X) of sectioned sagitta of a 3-year-old, hatchery-produced, pond-reared razorback <br />sucker from DNFH. D. Detail of C (100X), showing 2 annular marks. <br />from radii of otolith annuli since sagitta radius in razorback Early growth of Lake Mohave fish calculated from <br />sucker was highly correlated with SL at capture (r2 = 0.97 sectioned otoliths were consistent with and of the same <br />for 1og10 transformed data; Figure 5). Individual growth magnitudes of variation as in comparable-aged hatchery <br />histories Figure 6) were constructed on the assumptions stocks at DNFH for which size frequencies are available <br />that Lake Mohave specimens were accurately aged and that (Table 2). All wild-caught fish showed similar patterns over <br />otolith annulusiSL relationships for hatchery fish are the time (Figure 6). First year growth computed from pre- <br />same as for wild-caught specimens of the same (small) sizes. sumed annuli averaged 26.7±0.8% of SL at capture in <br />B