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<br />28 <br /> <br />II. B. <br /> <br />To ~elate YOY squawfish production and survival in the Yampa River <br />and YOY survival in the Green River with the natural ~ange of <br />therm2l.1 and flow ~egi mes observed, and determi ne an opti mal range <br />of combin.ations. <br /> <br />C. To dete~mine the existence and nature of imprinting 1n squawfish <br />stocks originating in Yampa Canyon. <br /> <br />III. Species interactions objectives: <br /> <br />A. To determine the population dynamics of fish species involved in <br />p!~edator-prey interactions with Colorado squawfish with respect <br />to relative abundance, size-age structure, spawning ecology, and <br />manipulative management potential of these species. <br /> <br />B. To determine the primary forage fish species or species <br />assemblages utilized by Colorado squawfish, and the degree of <br />substitution between fluctuating prey stocks. <br /> <br />IV. Hatchery-raised fish objectives: <br /> <br />A. To determine the survivability of yay and juvenile Colo~ado <br />squawfish in rive~ reaches with and without wild stocks, and <br />assess the potential of hatchery fish to supplement wild stocks <br />or ~ecolonize and expand in vacant river habitats within their <br />native range. <br /> <br />B. To determine imprinting and homing capabilities and migratory <br />behavior in hatchery-raised squawfish with regard to <br />establishing self-sustaining populations in natural river <br />envir-onments. <br /> <br />C. To determine the genetic distinction of Upper Basin wild stocks <br />from Lower Basin hatchery stocks of Colorado squawfish. <br /> <br />D. To determine the genetic distinction between stocks of Colorado <br />squawfish in the Colorado, Yampa-Green, White, and Gunnison <br />rivers. <br /> <br />V. Management-oriented objectives: <br /> <br />A. To determine the significance of fishing mortality upon squawfish <br />populations in the Colorado and Yampa rivers. <br /> <br />B. To determine 1T wild and/or hatchery-raised squawfish will use <br />bidirectional fish barrier passage devices during spawning <br />migrations or other long distance movements. <br />