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State: Colorado <br />Project No. F-325-R1 <br />Westslove_Wannwater Fisherie <br />Period Covered: July 1. 1996 to June 30. 1997 <br />Study Objective: To quantify and interrelate fish community responses and evaluate effectiveness of <br />programs and techniques to alleviate negative interactions between nonnative warmwater sport/nongame <br />fishes, found in floodplain pond, reservoir and riverine habitats, and native and threatened & endangered "big <br />river" fish species in western Colorado rivers, and to provide guidance for maximizing angling opportunity <br />for warmwater sport fish species in western Colorado within the constraints of identifying and implementing <br />strategies to preserve, protect and/or recover the state's native fish resource. <br />Job No. 1: Effectiveness of ISMP for Sampling Centrarchids in Riverine Habitats <br />Job Objective: To evaluate the effectiveness of the current Interagency Standardized Monitoring Program <br />(ISMP) fish sampling protocol in providing representative indices of centrarchid sport fish <br />abundance in riverine habitats of the Colorado River from Palisade to the Colorado/Utah <br />Stateline and recommend alternative sampling methods as identified. <br />Segment Objective 1: To develop study design to evaluate effectiveness of ISMP for developing <br />representative trends of centrarchid abundance in riverme habitats. <br />Segment Objective 2: To acquire catch-per-unit-effort (CPUE) data for centrarchid and other <br />nonnative fishes from existing ISMP data sets and evaluate variation in <br />catch statistics within years and year-to-year to facilitate assessment of <br />power thresholds of these data for detecting and tracking changes in <br />abundance of target nonnative fish species. <br />INTRODUCTION <br />Annual Program Guidance (USDI 1995, 1996, 1997) for the Recovery Implementation Program for <br />Endangered Fish Species in the Upper Colorado River Basin (UCRB) (USDI 1987) describes activities to be <br />performed under each of the major components of the recovery program (Table 1). The endangered fishes <br />include Colorado squawfish Ptychocheilus Lucius, humpback chub Gila cypha, bonytail Gila elegans, and <br />razorback sucker Xyrauchen texanus. The Recovery Program includes a component to control nonnative <br />fishes that may access and/or proliferate in the mainstem habitats of the UCRB. <br />Expenditures for the nonnative fish component of the Program have been comparatively small in the <br />past, but this portion of the annual budget has increased in recent years (Table 1) and is expected to increase <br />substantially in upcoming years (H. Maddux, U.S. Fish and Wildlife Service, personal communication). <br />Among the first major activities to address negative impacts of nonnative fishes in the UCRB was the <br />negotiation, approval and implementation of Procedures for Stockiag,NonnativeFish Species in the Unner <br />Colorado River Basin (CDOW et al. 1996, Appendix A) (hereinafter called simply Procedures)