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<br />002842 <br /> <br />. Detennine the need for adult screening at the diversion structures, <br /> <br />Objective 4: Detennine habitat use and limiting factors as the aUginented population expands, <br /> <br />. Use radiotelemetry to detennine spawning locations, overall habitat use, and range as the" <br />experimentally stocked Colorado pikeminnow reach adequate size (400 to 500 mm TL). <br /> <br />. Evaluate the importance of the lower 15 miles of the San Juan River as nursery habitat as <br />larval numbers increase, <br /> <br />. Evaluate the availability of nursery habitat in the lower San Juan River under various Lake <br />Powell water-level conditions iflarvae primarily drift to this area. <br /> <br />Objective 5: Continue flow recommendations evaluations as recovery efforts intensify, <br /> <br />. Use monitoring and research results to modify flow recommendations as needed. <br /> <br />Objective 6: Control normative fish in the San Juan River. <br /> <br />. Continue with normative fish mechanical removal during monitoring and resean:h activities, <br /> <br />. Evaluate other potential normative fish control measures (e,g., weirs, selective passage <br />structures, reduced levels of Lake Powell, flow manipulation), <br /> <br />. Develop measurable objectives and methods for assessing and maintaining effectiveness <br />of removal efforts. <br /> <br />. Develop normative fish stocking and baitfish policies in conjunction with the affected states. <br /> <br />3. ' Maintain and Enhance the Native fish Community <br />1he 7-year research period studies showed that most components of the native fish <br />community were quite abundant (flannelmouth sucker, bluehead sucker, speckled dace), but that <br />roundtail chub did not have a population in the San Juan River below Navajo Dam, <br />Earlier studies indicated that a roundtail chub population occurred at least downstream as <br />far as Shiprock, New Mexico. The common species of the San Juan River native fish community <br />need to be maintained since a healthy native fish community will assist in <br />recovery of the endangered species, Roundtail chub should be restored to the San Juan River <br />below Navajo Dam, A status survey on this species in the Colorado River Basin is presently being <br />conducted by the Bureau to detennine if listing is wammted, Low populations of roundtail chub <br />in some portions of the Colorado River Basin are a concern, <br /> <br />September 2000 <br /> <br />5-5 <br /> <br />Program Evaluation Report <br />