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<br />o Razorback suckers and Bonytail: <br />-Oilly hatchery-stocked fish are currently found in the Colorado River subbasin. It will <br />take 7-15 years to determine if stocked fish reproduce and contribute to the <br />establishment of a wild population. <br /> <br />Proposed Approach <br /> <br />Population Indicators <br />Based on the above limitations/realities, the following indices were selected to assess the status of or <br />trends in the endangered fish populations: <br /> <br />o Colorado pikeminnow <br />-size of the wild adult Colorado pikeminnow population based on surveys of the adult <br />population; <br />-structure of the adult population as determined by the length-frequency distribution of <br />wild adults; <br />-annual production of Colorado pikeminnow based on the capture of wild YOY fish <br />each fall; <br /> <br />o Humpback Chub <br />-structure of the adult humpback chub population as determined by the length- <br />frequency distribution of wild adult humpback chub; <br />-size of the wild adult humpback chub population (when these estimates are finalized); <br /> <br />o Razorbacks and Bonytails <br />-Colorado pikeminnow and humpback chub will serve as surrogates for razorback <br />suckers and bonytails to assess the status of their populations for 10 years or until self- <br />sustaining populations of razorbacks and bonytails are re-established. <br />Goals/expectations for razorbacks and bonytails will be established by the year 2005 <br />based on implementation of recovery actions (e.g., propagation and stocking, nonnative <br />fish control, instream flow management). Population data also will be used to assess <br />the status ofbonytail and razorback populations when those data become available. <br />Populations of bonytail and razorback need to show improvement by the 2015 <br />checkpoint. <br /> <br />2 <br />