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The present study formed one component of the Bureau of <br />Re-lamation's Glen Canyon Environmental Studies (GCES; reviewed <br />by Wegner, 1991), in which Phase II (see Patten, 1991) was <br />a?_-:horized to specifically ascertain if flow releases from the <br />dam could be modified to minimize impacts on natural and cultural <br />resc-srces downstream. <br />This report represents five years of research on four <br />indigenous big-river fishes of the Grand Canyon ecosystem: <br />Xyrauchen texanus, Catostomus latipinnis, C. (Pantosteus) <br />discobolus (family Catostomidae), and Gila cypha (family <br />Cyprinidae). The first and last species are currently listed as <br />"endangered," while the second is being evaluated for candidacy <br />a-.3 the third is believed secure. This study focused on <br />d-stributions, abundances, and survivability of these fishes <br />within the Little Colorado River and its confluence with the <br />mair ;tre-_m Colorado River, 99 river-kilometers downstream from <br />th:. ?am. As is often the case with scientific investigations, <br />more questions are asked than answers provided. In addition, more <br />questions are engendered by application of the scientific method. <br />Howe:•e-, data herein provide necessary baseline evidence for <br />long-term management of these fishes, and will (hopefully) serve <br />as springboard to more extensive investigations of the entire <br />indigenous fish community in the Canyon (to include smaller adult <br />forms (such as speckled dace, Rhinichthys osculus) as well]. This <br />is as it should be. <br />4