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the lack of discrimination between habitats used by these fishes. Although <br />our future analyses of the available data will examine the river sections <br />individually, previous analyses of similar data from a restricted section of <br />the Green River (McAda and Tyus 1982) also showed high spatial overlap between <br />habitats used by age-0 Colorado squawfish, red shiner and fathead minnow. <br />Results of our analyses suggest that water management directed toward <br />increasing the amount of habitat available to age-0 Colorado squawfish, while <br />reducing those of the introduced species, may not be feasible. Although more <br />detailed field investigations of habitat use by these species might aid our <br />understanding of whether subtle but important differences in habitat use occur <br />among these species, It seems unlikely that important differences in habitat <br />use between age-0 Colorado squawfish and the other species examined would <br />emerge from such efforts. Moreover, subtle differences in habitat use among <br />these species that might emerge as the result of more detailed studies would <br />probably be of little practical value in management because flows cannot be <br />closely regulated and the effect of a particular flow on habitat availability <br />differs among locations along the river. Perhaps more important at this time <br />is the need for us to understand which of the sympatric species present <br />important problems for Colorado squawfish. Such specific knowledge would <br />allow us to better focus our management efforts toward the goal of recovery <br />Colorado squawfish in the Upper Colorado River Basin. <br /> 1Q <br />s ,~ <br />