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<br />Preface <br /> <br />This project was jointly sponsored. It was initiated with support by Colorado Division of <br />Wildlife (CD OW) through its GO-CO Program and completed with support by the Upper <br />Colorado River Endangered Fish Recovery Program (Recovery Program). Under CDOW <br />sponsorship, development of longnose sucker Catostomus catostomus larvae and early juveniles <br />was studied and described and illustrated in an initial version of the descriptive species account <br />using a previously preserved developmental series and selected wild-caught specimens in the <br />Larval Fish Laboratory (LFL) Collection (Snyder 2001). Also, ripe adults were acquired and <br />artificially spawned, and culture and preservation of new developmental series was begun for <br />additional study and description. Under Recovery Program sponsorship, culture and <br />preservation of the new developmental series was completed and, as presented in this final <br />report, descriptive data and an additional illustration from the new series have been incorporated <br />in the longnose sucker species account, corrections and new data and illustrations for existing <br />descriptions of other suckers in Snyder and Muth (1990) have been documented, the <br />"Comparative Summary" therein has been updated and expanded, and the keys therein have been <br />replaced with an updated and expanded computer-interactive key. This final report to the <br />Recovery Program, with appropriate modifications, constitutes a manuscript for more formal <br />publication as a supplemental update of Snyder and Muth (1990). However, as a preferred <br />alternative, the Recovery Program is supporting it's incorporation in a retitled, updated, and <br />expanded edition of the 1990 publication. The new edition will be published through the <br />Colorado Division Wildlife as part oftheir Technical Publication series and should be available <br />in Spring 2004. <br /> <br />7 <br />