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<br />~ " <br /> <br />nonnative fishes. <br /> <br />To date, two studies has been implemented under this element: <br />AnnuaL assessment of Colorado squawfish reproduction and <br />larval abundance in the lower Vampa River, Colorado, and the <br />lower Green River, Utah, and <br /> <br />an assessment of mainstem spawning in the lower Vampa River <br />and the Green River by razorback sucker. <br /> <br />The first study was initiated in 1991 and is scheduled to continue <br />throughout the overall research program period. The second study <br />was initiated in FY 1992 as a pilot study and will continue for 2 to <br />4 years subject to yearly reevaluation. Additional studies which <br />will be implemented as part of the Reproduction Element include: <br />an analysis of existing collections for young razorback sucker and <br />humpback chub to document past spawning success. In addition, if <br />specimens are found, collection information will be related to flow <br />conditions during season/year of capture. <br /> <br />Recruitment of AGe-O Fish (survival of aGe-O fish to fall) <br /> <br />Data gathered from these studies will provide information on several <br />topics including: 1) relationships between relative reproductive <br />success and annual relative abundance of age-O Colorado squawfish, <br />2) effects of regulated summer/fall flows on survival and growth of <br />fishes in backwaters (including effects on abundance/reproduction of <br />nonnative fishes), and 3) effectiveness of ISMP (and other <br />approaches) for measuring recruitment of age-O Colorado squawfish <br />and/or relative abundance of other fishes. <br /> <br />. -At present, two studies have been implemented and are ongoing: 1) <br />"Availability and quality of nursery habitat", and 2) "An evaluation <br />of Colorado squawfish recruitment". Aspects of the study to <br />evaluate Colorado squawfish recruitment also relate to the Age-l <br />Recruitment Element. <br /> <br />Recruitment of AGe-l Fish (factors affectinG abundance and <br />distribution) <br /> <br />Data collected under this element will provide information for <br />evaluation of effects of winter releases from FGD on young fish. In <br />addition, it will allow for an assessment of effects of spring- <br />runoff flows on age-l fish. <br /> <br />The primary study related to this element was originally "Overwinter <br />survival". Original objectives for the overwinter-survival study <br />included development of a marking method so that survival of young <br />Colorado squawfish from age 0 (fall) through age 1 (spring, post- <br />runoff) could be quantified. However, during 1991, efforts directed <br />at developing such a method were unsuccessful. Additional <br />objectives include monitoring of overwinter movement and <br /> <br />Flaming Gorge Studies <br /> <br />12 <br />