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<br />C) <br />c:-) <br />....~ <br />{.O <br />(." <br />~.~ <br /> <br />The 7- year research period studies provided encouraging results for meeting the overall goal of recovering <br />Colorado pikeminnow and razorback sucker in the San Juan River, Although initial studies of overall low <br />populations of both species and low amounts of key habitats were discouraging, the introduction ofYOY <br />Colorado pikeminnow and subadult razorback sucker showed that the fish could survive, grow and, in the <br />case of razorback sucker, reproduce in the San Juan River, Most other native fishes were abundant in the <br />San Juan River, except roundtail chub, indicating that the river provided habitat for large populations of <br />other members of the native fish community. Comparisons of habitat quantity and quality with other Upper <br />Basin rivers showed that habitat quantity and quality in the San Juan River was comparable, and the fish <br />found and used rare habitats, Reoperation of Navajo Dam allowed study of various flow regimes and their <br />effects on key fish habitat. This provided for development of flow recommendations that will create, <br />maintain, and maximize key habitats at the proper time of the year to meet the life history needs of the <br />endangered fishes. Together, these factors indicate that the San Juan River has high potential for providing <br />demographically viable populations of both species that wilI be important in recovering the two species not <br />only in the San Juan River, but throughout the Colorado River Basin. <br /> <br />September 2000 <br /> <br />3-62 <br /> <br />Program Evalua1ion Report <br />