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1.0 INTRODUCTION ' 1.1 Background ' The Upper Colorado River Endangered Fish Recovery Program (UCRRP) considers nonnative fishes as a principal threat to the endangered Colorado pikeminnow (Ptychocheilus lucius), razorback sucker (Xyrauchen texanus), humpback chub (Gila cypha), and bonytail (Gila elegans). Over 35 species of nonnative fishes have been identified in the upper basin (Tyus et al. 1982j; many are predators, competitors, and vectors of diseases and parasites (Bestgen 1990). A , workshop held in 1996 concluded that broad-scale control is not feasible, and specific control strategies that target particular species should be implemented and evaluated (Tyus and Saunders 1996) , . 1.2 Purpose and Objectives of Workshop ' The UCRRP convened a Nonnative Fish Control Workshop on February 13-14; 2002, in Grand Junction, Colorado. The purpose of the workshop was to bring together fish researchers and ' managers to discuss and evaluate nonnative fish control efforts implemented to date in the Upper Colorado River Basin. Information exchanged at the workshop will be used to modify and refine tasks of the Nonnative and Sport Fish Management element of the UCRRP's Recovery Action , Plan (RIPRAP). Tasks of this element are designed to reduce negative impacts of problematic nonnative fishes on the endangered fishes of the upper basin. The worksho was attended b 45 researchers, mana ers, and re resentatives of State and p Y g p Federal agencies, water users, and energy distributors involved in the UCRRP, as well. as representatives of the Bureau of Reclamation, Lower Colorado Region. Presentations were made ' by individual researchers on each of the tasks identified in the program element on Nonnative and Sport Fish Management. For each task presentation, the workshop objectives were to: • present what is being done to control nonnative fishes in the upper basin, , including results and indices being used to evaluate success; • identify desirable responses over the short and long term for each problematic nonnative species; ' • discuss and evaluate strategies that have or have not achieve desired responses over the short and long term; and • for strategies that have not achieved desired responses, identify alternatives or 1 modifications that will achieve desired responses. Following the presentations, a moderator solicited input from the attendees and all information- ' was recorded. A summary of workshop conclusions and recommendations was provided to the Biology Committee and Management Committee of the UCRRP on February 21, 2002.