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2 Job 3. Title: Northern pike habitat utilization Objective: To determine relative habitat utilization and preferences of adult northern pike versus Colorado squawfish in the Yampa River during pre-runoff, runoff, and post-runoff flow regimes. Job 6. Title: Standardized monitoring surveys Objectives: 1) Determine trends in the populations of the endangered fishes; 2) Develop empirical models that aid our understanding of the environmental variables that affect these population trends; 3) Determine the efficacy of management actions intended to aid in recovery of the species; and 4) Assist in establishment of definitive recovery goals. " Job 7. Title: Razorback sucker inventory above Palisade Objective: To determine the presence and distribution of razorback sucker in the Colorado River between the Grand Valley Diversion Dam and Parachute, Colorado. Job 8. Title: Colorado squawfish sportfishery in Kenney Reservoir Objective: To evaluate Colorado squawfish as sportfish in Kenney Reservoir. METHODS Job 1. Title: Gamefish species life history data Sampling was conducted in spring backwaters in the Yampa River from Apri1- June, 1991. Collections of northern pike and channel catfish were used for population characteristics, spawning ecology, distribution, habitat selection, movements, presence of endangered species. Methods used were similar to those reported in Nesler (1991). Northern pike and channel catfish were removed from spring backwater habitat to observe responses in use of this habitat type by Colorado squawfish and other fish species. Eight, I-week trips were made, covering from river km (RK) 188-72. Job 2. Title: Gamefish predation upon endangered fishes Northern pike and channel catfish collected during sampling trips scheduled in Job 1 on the Yarnpa River were processed for stomach content analysis of fish species ingested. Gape measurements for northern pike and channel catfish, and body depth-width measurements for associated species were also collected to establish potential vulnerability to predation by pike and catfish. In the Colorado River, two one-week trips were made in July 1991. Two backwaters were selected for daytime sampling Qf centrarchid predators and