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<br />. <br /> <br />. <br /> <br />. <br /> <br />compare data collected in this study to ISMP data to <br />assess refinement of ISMP procedures and ways to increase <br />use of data currently being collected. Late summer/fall <br />relative abundance of age-O Colorado squawfish (and other <br />co-occurring fishes) in backwater habitats in <br />representative reaches will be measured. Most age-O <br />Colorado squawfish of sufficient size for field <br />identification will be released after capture; small sub- <br />samples will be preserved (ethanol) for laboratory <br />studies on age, condition, etc. Measurement of selected <br />physicochemical parameters will be conducted. Video <br />imaging of nursery habitats will be jointly conducted. <br />Objectives of the study on evaluation of Colorado <br />squawfish recruitment are to evaluate existing <br />information to determine relationships between relative <br />abundance of age-O and age-1 Colorado squawfish and river <br />conditions in fall, early spring, and late spring/early <br />summer; evaluate factors (environmental and behavioral) <br />that may influence measurements of relative abundance of <br />young Colorado squawfish from fall to spring; and <br />evaluate existing information on relative abundance of <br />various size classes of Colorado squawfish. Along with <br />evaluation of existing information, non-lethal marking of <br />wild young Colorado squawfish from the Ouray area in fall <br />will be conducted to assess habitat use and overwinter <br />survival. Results will be used to prepare an issue paper <br />summarizing current knowledge, assessing effectiveness of <br />procedures for predicting overwinter survival relative to <br />different flow conditions, and identifying factors <br />potentially affecting the status of Colorado squawfish in <br />the Green River system. The issue paper will be used to <br />improve procedures for measuring recruitment of young <br />Colorado squawfish. <br />Data gathered from these studies will provide <br />information on several topics including relationships <br />between annual relative abundance of age-O Colorado <br />squawfish and relative reproductive success, effects of <br />regulated summer/fall flows on survival and growth of <br />fishes in backwaters (including effects on non-native <br />fish abundance/reproduction), and effectiveness of ISMP <br />(and other approaches) for measuring age-O Colorado <br />squawfish recruitment and/or relative abundance of other <br />fishes. <br /> <br />ELEMENT 3 - OVERWINTER SURVIVAL 01' YOUNG PISK (age-l <br />recruitment). This element addresses hypotheses 3,4,5, <br />11, and 12. It could Closely follow approaches taken in <br />ELEMENT 2 to address similar questions for age-1 Colorado <br />squawfish and other co-occurring fishes and establish <br />links between fall vs spring abundances. However, final <br />details on the scope of ELEMENT 3 await team assessment <br />of needs and possible approaches. As mentioned under the <br />summary of ELEMENT 2, aspects of the study to evaluate <br />Colorado squawfish recruitment (integrated with a <br />