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<br />o <br />o <br />(~ <br />."" <br />. .." <br /> <br />9 <br /> <br />.... sequential guidelines delineated by the Upper Colorado River Basin Recovery Implementation <br />o Program Genetics Panel: <br /> <br />1. Use locally-adapted stocks. If stocks of wild San Juan River razorback sucker <br />are available, progeny from paired matings of these fish should be used. <br />Progeny of San Juan River arm of lake Powell adults have been used in lieu of <br />progeny of wild riverine adults in all stockings in the San Juan River to date. <br /> <br />2. Use nearest neighbor. The nearest geographic neighbors to the San Juan River <br />are the Green and Colorado River populations. <br /> <br />3. Use razorback sucker from populations that have the most genetic diversity. <br />The lake Mohave stock is the most genetically diverse of any remaining <br />razorback sucker population. <br /> <br />Throughout the 5-year augmentation effort, the selection of stocks to be used in the <br />augmentation will depend upon site and time specific conditions concerning the host stock to <br />be used. Various conditions in anyone year affecting either the source populations or the San <br />Juan River population can determine, upon review by the Service and the San Juan Recovery <br />Implementation Program Biology Committee the source or sources of razorback sucker to be <br />used in the augmentation plan and the sites and numbers for stocking in the San Juan River. <br /> <br />Based on the experimental stocking to date, large fish (;,400 mm total length) should be used <br />for stocking. Stocking of razorback sucker at the maximum size attainable in one growing <br />season (apprOJ(imately 300 mm) may be acceptable, and will make the most efficient use of <br />hatchery space while still allowing for production of adequate numbers of fish. <br /> <br />The plan is intended to establish a population of 15,900 razorback sucker in the 159 miles of <br />river between the Hogback Diversion Dam and Clay Hills boat landing. <br /> <br />Initially, excess fish from existing facilities will be the only fish available for augmentation <br />efforts, the San Juan Recovery Implementation Program has no hatchery facilities and <br />brood stock of its own. Despite this current lack of production facilities, the San Juan <br />Recovery Implementation Program has the opportunity to begin augmentation of razorback <br />sucker at little cost to the program, while still following the sequential genetic guidelines listed <br />above. Currently, three groups of excess fish are available for use; numbers of fish available <br />in Fiscal Year 1997 are presented in parentheses: <br /> <br />1. Horsethief State Wildlife Area (Grand Junction, Colorado) anslng from paired <br />matings of adults from the San Juan River arm of Lake Powell and Colorado River. <br />(3,500 fish) <br /> <br />2. Ouray National Fish Hatchery (Ouray, Utah) arising from both streamside spawnings <br />and paired matings of Green River adults. (1.300 fish) <br /> <br />3. Willow Beach National Fish Hatchery (Willow Beach, Arizona) arising from larval <br />collections from Lake Mohave. (1,000 fish) <br />