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<br />0015-4-3 <br /> <br />to mechanical removal efforts. In 2003 the Service began a translocation program <br />funded by Reclamation for humpback chub above Chute Falls in the LCR and GCNP is <br />examining other tributaries to the Colorado River in the park to assess their suitability for <br />translocations. Related to translocations, Paukert and others (in review) examined site <br />fidelity of humpback chubs. <br /> <br />The use of Glen Canyon Dam releases to negatively impact non-native fish (Davis and <br />Batham 2003, Korman and others 2003), in addition to directly improving habitat for <br />native fish, has been incorporated into the development of a program of experimental <br />flows to satisfy the needs of element 1 a. Another impediment to establishment of a <br />second spawning aggregation is the determination of genetic relatedness among <br />aggregations of humpback chub in Grand Canyon. Valdez and Ryel (1995) established <br />the presence of nine aggregations of humpback chub, including the individuals in the <br />LCR. Genetic evaluations underway by Colorado State University (Douglas and <br />Douglas 2003a, 2003b) on the entire taxon and by the Service on humpback chub <br />collected in the LCR and held at Willow Beach National Fish Hatchery will provide <br />important information in making these determinations. Both projects are scheduled to be <br />completed in 2004. <br /> <br />STATUS OF ELEMENT 4 <br /> <br />OnQoing. Investigations and actions are in progress to establish a second population of <br />humpback chub as identified by Valdez and others (2000). Reclamation believes that, in <br />the aggregate, all of these activities represent a system-wide approach at improving <br />humpback chub viability throughout the Grand Canyon ecosystem. <br /> <br />9 <br />