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<br />. <br /> <br />. <br /> <br />provide the data necessary for a Biological Opinion on the operation of <br />the Aspinall Unit, <br /> <br />The data collected as part of this study will also give considerable <br />insight into the reproductive ecology and habitat requirements of the <br />endangered fishes, In addition, interactions between native and <br />introduced fish species will be investigated. These data are necessary <br />to formulate effective management strategies for the endangered fishes of <br />the Colorado River basin. <br /> <br />Ill, Study Goals, Objectives, End Product: <br /> <br />A. Goal: <br /> <br />Evaluate the biological and physical responses of the Gunnison and <br />Colorado River ecosystems to seasonal test flows from the Aspinall <br />Unit. <br /> <br />B. Objectives: <br /> <br />1. Track the reproductive success of endangered fish and other <br />species in the Gunnison and Colorado rivers, and determine the <br />relationship between physical variables, biological variables, and <br />spawning success of endangered fish and other fish species, <br /> <br />2. Evaluate recruitment of endangered fish from age 0 to subsequent <br />life history stages and determine the relationship between <br />seasonal parameters and survival of young fish, <br /> <br />3. Monitor the relative abundance and population structure of <br />endangered fishes and sympatric species to acquire information on <br />interactions among species, and how various physical parameters <br />may differentially effect species. <br /> <br />4. Determine the relationship between quality and quantity of <br />important habitat types and seasonal flows of various levels. <br /> <br />5, Establish the relationship between geomorphology of river system <br />and fish habitat, and how these factors influence the distribution <br />of the endangered fishes. <br /> <br />C, End Produc t : <br /> <br />Biologically-based, seasonal flow recommendations for the Gunnison <br />and Colorado rivers that will benefit endangered and native fish <br />species. <br /> <br />2 <br />