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<br />- <br /> <br />_"""''''..'''''''''"....''''''''''w'''',r.,~~_._, "',,,_.,, ^-_. <br /> <br />n <br /> <br />81 <br /> <br />of allocating a flow resource in such a way as to satisfy legally pre- <br /> <br /> <br />ferred current demands without foreclosing nhe satisfaction of a differ- <br /> <br /> <br />ent set of configuration of demands in the future, When so viewed. it <br /> <br /> <br />is clear that there will be no single or final solution to the problema <br /> <br /> <br />of allocation and management in the Colorado River Basin, The time for <br /> <br /> <br />seriously addressing the emerging generation of problems. however, 1s <br /> <br />now." <br /> <br />This paper summarizes the present knowledge of the effects of var- <br /> <br />ious management practices on fish and macroinvertebrates in the Upper <br /> <br />Colorado River. attempts to identify future effects of alterations in <br /> <br />streamflow and water quality on these animals. and offers recommenda- <br /> <br />tions for future research, <br /> <br />Fish Fauna of the Upper Colorado River Basin <br /> <br />~r <br /> <br />The Colorado River Wildlife Council listed fifty species and four <br /> <br /> <br />subspecies of fish in the Upper Colorado River (Richardson. 1976). <br /> <br /> <br />Twenty of these species (40 percent) and the four subspecies are native <br /> <br />to one or more states in the upper basin. but some have been introduced <br /> <br /> <br />into other states, Thirty species (60 percent) have been introduced at <br /> <br /> <br />various times into the river system. In a recent study by the Utah <br /> <br /> <br />Cooperative Fishery Research Unit. twenty-nine species of fish were re- <br /> <br /> <br />corded in the major tributaries to the Upper Colorado River (Holden and <br /> <br /> <br />Stalnaker. 1975). Ten of these species (34,5 percent) were native to <br /> <br /> <br />tbe river and nineteen were introduced, Other investigators have re- <br /> <br /> <br />ported a bigh perce~tage of introduced species in the lower basin as <br /> <br /> <br />well (Minckley and Deacon. 1968). <br /> <br />