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The taxonomy of the three endemic Gila species also was investi- <br />gated. A review of the meristic characteristics of these fish by FWS <br />field staff and several noted taxonomists was undertaken along with <br />cytogenetic karyotyping of the various Gila spp. by a scientist at the <br />University of Utah. In addition, tissue from Gila spp. was provided to <br />workers at Arizona State University for electrophoretic analysis. <br />The changes in riverine fish habitat with changes in flow were <br />determined by conducting hydraulic flow simulations based on the FWS <br />program of IFG flow modeling. Three representative sites were modeled on <br />the Colorado River and three were modeled on the Green River. The <br />results or predictions from these modeling efforts were correlated to the <br />critical habitat needs of the endangered fishes to assist in establishing <br />flow needs. In concert with this flow modeling effort, water temperature <br />modeling was also conducted to relate flows and temperature and also <br />temperature needs of the various life stages of the target fish. <br />W <br />a <br />4