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<br />( <br /> <br />o <br />o <br /><:> <br />v) <br />..:i <br />c;n <br /> <br />be a suitable option for investigating the <br />biological response of endangered fish to different <br />flow regimes. However, if augmentation is to be <br />used to assist research efforts an approved <br />augmentation plan for the San Juan River basin will <br />be necessary to guide use of hatchery raised <br />endangered fishes to accomplish research objectives <br />as well as recovery goals. Implementation of a <br />full scale augmentation plan within the seven year <br />research period may not be possible or desirable. <br /> <br />A alternative recommendation would be to use <br />hatchery-raised, sterilized fish in radio telemetry <br />studies to assess movements and habitat use and to <br />locate more wild fish. <br /> <br />Methods: <br /> <br />Adult Colorado squawfish (1981 year class) spawned <br />at willow Beach National Fish Hatchery and <br />presently held at Page Springs State Fish Hatchery <br />would be used for this study segment. During the <br />fall of 1991, experimental fish will be sterilized <br />by severing the posterior attachment sites for <br />ovaries and testes. Experimental and control fish <br />will be held over winter in a recirculating raceway <br />system at willow Beach NFH to provide current <br />conditioning and to acclimate to a more natural <br />diet. Experimental fish would be examined for <br />reproductive condition, and if incapable of <br />reproducing, recovered and held in the raceway for <br />potential future use. Use of the experimental fish <br />would depend on the numbers of wild adult squawfish <br />collected during the fall of 1991 and spring/summer <br />of 1992. <br /> <br />( <br /> <br />CATEGORY- TRIBUTARY ICHTHYOFAUNAL SURVEYS <br /> <br />Status: <br /> <br />Proposed investigation <br /> <br />Lead Agencies: Utah Division of Wildlife Resources (Tributary <br />streams in Utah) <br /> <br />New Mexico Dept. of Game and Fish (Tributary <br />streams in New Mexico and Colorado) <br /> <br />Task: <br /> <br />Ichthyofaunal survey of perennial tributaries of <br />the San Juan. <br /> <br />Timeline: <br /> <br />Phase II (FY 1992-1994) <br /> <br />Objectives: <br /> <br />To thoroughly inventory the fish community in the <br />warmwater reaches of the. Los Pinos, Piedras, <br /> <br />L <br /> <br />14 <br />