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<br />( <br /> <br />':":) <br />~~ <br />(") <br />01 <br />-.J <br />c.n <br /> <br />secondary channels has indicated that fish <br />communities may be different than main channels. <br /> <br />The purpose of the Secondary Channel study is to <br />document species present, their relative abundance, <br />size range (life stage), macro-habitat <br />associations, and seasonal use patterns. <br /> <br />Methods: <br /> <br />The study is an ongoing three year field effort <br />slated for completion in 1993. Secondary channels <br />have been tentatively classified according to <br />length and flow and will be sampled and <br />characterized according to their fish fauna, <br />macrohabitats, and water quality. <br /> <br />Methods for fish collections will be similar to <br />mainstem efforts. However, due to the habitat <br />being sampled collections will be made primarily <br />with seines. Other methods such as electrofishing <br />and passive netting will be used when appropriate. <br />Fish collected will be identified, weighed and <br />measured. Target species collected will also be <br />tagged and have tissue removed for genetic <br />analysis. Radio transmitters will be implanted (if <br />feasible) according to established procedures. <br /> <br />( <br /> <br />CATEGORY- AUGMENTATION STUDIES <br /> <br />Status: <br /> <br />Proposed investigation <br /> <br />Lead Agency: <br /> <br />Fish and Wildlife Service, Region 2 (Fisheries <br />Assistance Office) <br /> <br />Tasks: <br /> <br />Feasibility study - Neutering of adult, hatchery- <br />reared Colorado squawfish for use in San Juan River <br />telemetry studies. <br /> <br />Timeline: <br /> <br />Phase II (FY1992-1994) <br /> <br />Objectives: <br /> <br />Determine if hatchery raised Colorado squawfish can <br />be sterilized to prevent spawning without altering <br />physiology and/or behavior. <br /> <br />Ascertain if Colorado squawfish can be acclimated <br />to natural conditions in a hatchery. <br /> <br />Research Need: At present it is unclear whether there are <br />sufficient numbers of endangered fish in the San <br />Juan River to detect a biological response to flow <br />manipulation. The use of . artificially produced <br />progeny from wild stocks of San Juan River fish may <br /> <br />L <br /> <br />13 <br />