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<br />1.1. Objectives <br /> <br />The general objective of the 1993 investigation of Mathers Hole and Cleopatras Couch was to <br />build on the 1991 work and the more specific objectives were to: <br /> <br />1. Test the PRM at a known spawning site where the physical conclitions are somewhat <br />different to those where it was initially developed, <br /> <br />2. Evaluate whether the observed patterns of squawfish congregation at different locations <br />during the spawning period (Tyus and Karp,l989) can be related to physically-based <br />changes at the individual spawning bars at different discharges during the recessional <br />flows, <br /> <br />3. Attempt to develop physically-based criteria for locating other potential Colorado <br />squawfish spawning locations that could then be evaluated by the fisheries biologists, <br /> <br />4. Begin to address the question of the required frequency of bar-forming discharges at <br />the spawning locations. <br /> <br />Observations made during the field work indicated that water chemistry may also be involved in <br />spawning bar selection by the squawfish, a postulate that had previously been advanced In regard to <br />chemoreceptive imprinting (Wick et aI., 1983; Tyus ancl Karp, 1989; Tyus, 1990). Water chemistry data <br />that had been collected by the USFWS (Data provided by C. McAda) in 1981 were evaluated as part <br />of this investigation. Because field observations indicated that the geologic setting could be Involved <br />in the water chemistry issues, a geologic map of the lower Vampa Canyon was constructed (Figure <br />1.3). <br /> <br />1.5 Resource Consultants & Engineers, Inc. <br />