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<br />002832 <br /> <br />Further, the following species interactions and recovery actions are anticipated: <br /> <br />1) Razorback sucker biomass increase above 5% will cause reduction in biomass of <br />flannelmouth sucker due to more similar low-velocity habitat use and potential <br />competition, <br />2) Biomass and production of common catp and white sucker will be reduced by control <br />efforts, therefore reducing competitive pressure upon sympatric native suckers, and <br />perhaps facilitating expansion of razorback sucker beyond the 5 % target biomass, <br />3) With successful establishment of an adult razorback sucker population, general abundance <br />of other native species may be reduced as a result of some competition, <br /> <br />Reach priorities were based on the following considerations: <br /> <br />1) The Colorado River (Rifle to Debeque) and Gunnison River reaches are higher priority <br />than the Palisade to Stateline reach of the Colorado River due to the higher relative <br />abundance of native fishes in general and native suckers in particular, and the lack of an <br />abundance of large predaceous fish species; suggesting a more favorable environment for <br />survival. <br />2) Concentrations of selenium that may impact razorback sucker reproduction adversely via <br />survival of larvae appears to be greater in the Gunnison River reach, making the upper <br />Colorado River reach potentially more favorable for reintroduction, and ultimately, <br />successful reproduction and survival of young razorback sucker. <br /> <br />Stocking Plan - Bonytail (Table 2) <br />BonytaiI are considered the second highest priority for stocking, but only due to the high <br />value of expanding the genetic material remaining in the few, viable stocks of razorback sucker <br />left in the wild. BonytaiI are functionally extirpated in the wild and restoration stocking of <br />progeny from the remaining captive stock is the only recourse for re-establishing populations, <br />The source for bonytaiI to be stocked will be from the captive broodstock currently being held <br /> <br />DRAFT - June 4, 1997 <br /> <br />8 <br />