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<br />" <br /> <br />870 <br /> <br />ment, and mortality. Unfortunately, the need to <br />sacrifice fish to extract otoliths is an obvious draw- <br />back of this method, especially when working with <br />a species of special concern like roundtail chub. <br /> <br />Acknowledgments <br /> <br />I would like to thank lody Walters for his valu- <br />able input into study design, Mike Childs for <br />spawning and rearing fish, and Diana Rogers and <br />Lorraine A venetti for their valuable field and lab- <br />oratory assistance. I would also like to thank Scott <br />Bonar, Scott Bryan, Bill Persons, and three anon- <br />ymous reviewers for providing suggestions that <br />improved the manuscript. Funding was provided <br />by the Sportfish Restoration fund administered <br />through the Arizona Game and Fish Department <br />(Project F-4-R). Reference to trade names does not <br />imply endorsement by the U.S. Government. <br /> <br />References <br /> <br /> <br />Barrett, P. 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