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EXECUTIVE SUMMARY <br />This study was initiated (proposed and funded in 1994; FY-1995) as a three year study <br />to address the current status of the four endangered fishes in the Upper Basin, <br />Colorado River and to determine management objectives that could be implemented to <br />enhance those populations. The study contains two main segments. Utah State <br />University was responsible for developing models that could be used for each of the <br />fish species and to collect and synthesize any data relevant to understanding the <br />population dynamics of the endangered fish. Those data would later be used to <br />parameterize the models for future simulations. Utah Division of Wildlife Resources <br />developed the management objectives that would be used to run simulations. This <br />document only reports on the first segment of the overall study. Development of the <br />management objectives and the use of the models reported here toward accomplishing <br />those objectives are reported in a separate document provided by UDWR. <br />The objectives of this study were to: 1) Develop a generalized model that could be <br />modified for use for all four species of endangered fish (Colorado squawfish, <br />Razorback sucker, Humpback chub and Bonytail chub) found in the Upper Basin of the <br />Colorado River; 2) Use expertise from Upper Basin biologists to identify specific spatial <br />attributes for model development and data sources to be used for parameter estimates <br />using a workshop format; 3) Collect, analyze and synthesize all data pertaining to life <br />history attributes of the fish species to be used in the final model development; 4) <br />VIII <br />