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<br />o <br />o <br />(") <br />(i:..~ <br />....:! <br />..:::. <br /> <br />( <br /> <br />t. <br /> <br />Research Need: Early life history investigations are important for <br />determining spawning and recruitment of target <br />species and the potential effectiveness of some <br />management options. Research in the upper basin of <br />the Colorado River has indicated a link between <br />flows and successful recruitment of endangered <br />fish. This relationship needs to be quantified for <br />the San Juan River to effectively manage flow <br />releases for endangered fishes. <br /> <br />Methods: <br /> <br />Drift netting for larval fish will be conducted <br />daily at two locations in the study area between <br />June 15 and August 15. Three seining trips <br />sampling larval distribution of fish will be <br />conducted concurrent with drift sampling to sample <br />low velocity habitats for larval and YOY fish. <br />Overwinter survival of fish will be determined by <br />conducting two sample trips to compare relative <br />densities of fish in fall and spring samples in low <br />velocity habitats <br /> <br />CATEGORY- SECONDARY CHANNEL ICHTHYOFAUNAL CHARACTERIZATION <br /> <br />Status: <br /> <br />Ongoing Core Research Program <br /> <br />New Mexico Dept. of Game and Fish <br /> <br />Characterization of faunal assemblages and physical <br />habitat in secondary channels. <br /> <br />Lead Agency: <br /> <br />Task: <br /> <br />Timeline: <br /> <br />Phase I and II (FY 1991 thru 1994) <br /> <br />Objectives: <br /> <br />Characterize type and extent of secondary channels <br />in the San Juan River. <br /> <br />Characterize <br />channels, <br /> <br />assemblages <br /> <br />faunal <br /> <br />of <br /> <br />secondary <br /> <br />Determine seasonal use patterns of secondary <br />channels by target species. <br /> <br />Relate habitat use and availability of secondary <br />channels to flow levels. <br /> <br />Research Need: <br /> <br />Ichthyofaunal sampling in the San Juan River during <br />the last five years has concentrated primarily on <br />main channel and backwater habitats. Secondary <br />channels, however, are a significant component of <br />the habitat in the San Juan River between Shiprock, <br />New Mexico and Bluff, Utah. Cursory sampling of <br /> <br />12 <br />