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<br />") <br /> <br />1337 <br /> <br />Obiectives: <br /> <br />, <br />,;' <br /> <br />The objectives of this portion of the San Juan River monitoring effort are to obtain data that will <br />aid in the evaluation of the response (e.g.. reproduction, recruitment, and growth) of native and <br />nonnative fishes to different flow regimes and other management actions (e.g., impediment <br />modification), track trends in species populations (e.g., abundance and relative condition) and <br />characterize patterns of habitat use. The data will also be available to all researchers and may <br />be used in conjunction with data obtained in other studies to evaluate future management <br />activities. <br /> <br />Methods: <br /> <br />~-~ <br />":"1 <br />r~:.__,~ <br /> <br />The study reach (Farmington to Clay Hills Crossing) includes geomorphic reaches 1 through 6; <br />with Reach 1 being the most downstream. As determined by the SJRRIP Biolpgy Committee, <br />sampling will occur every third mile within the study reach. Secondary channels are defined <br />as channels having less than 25 % of the volume of flow at the time of sampling and are at least <br />300 m in length. Inflow at the top of a channel is not necessary for it to be classified as a <br />secondary channel. If any portion of a secondary channel (except mouth) is within a designated <br />sample mile, the secondary channel will be sampled. Young-of-year/small-bodied fish <br />monitoring will occur in conjunction with the large-bodied fish monitoring effort. <br /> <br />All secondary channels in each third-mile will be sampled. Primary channel shoreline habitats <br />will be sampled in 3-mile increments. One primary channel and secondary channel sampling <br />will be within the same river miles. In addition to structured primary channel sampling, all <br />backwaters and embayments (> 25 m2) associated with the primary channel within each third- <br />mile will be sampled. <br /> <br />-.." <br /> <br />Sample sites within secondary channels will be a sufficient distance from the inflow to and <br />outflow from the secondary channel to minimize primary channel faunal and physiochemical <br />influences. Secondary channel sample sites will be at least 100 and not more than 200 m in <br />length. All mesohabitats (e.g., pool, riffle, riffle-eddy, and shoal) within the site will be <br />sampled in approximate proportion to their availability within the site; typically. at least five <br />mesohabitat types will be sampled in each secondary channel. Each mesohabitat will be sampled <br />separately with 3.2 x 1.6 m (4 mm mesh) drag seines. Each secondary channel sampling effort <br />will be a minimum of 5 seine hauls. The number of seine hauls, total area (m2) seined, and <br />types of mesohabitats sampled will be recorded on standard field forms. Specimens collected <br />in each mesohabitat will be inspected to determine if any rare fishes (Colorado pikeminnow, <br />roundtail chub, and razorback sucker) are present in the seine. If a rare fish is captured, it will <br />be identified, total length (:1:1 mm) and weight (:1:1 g) determined, and released. Any rare fish <br />> 150 mm TL will be scanned to determine presence of a PIT tag. If none is present, the <br />specimen will be implanted with a PIT tag having a unique alphanumeric code. All pertinent <br />data (i.e., total and standard lengths, weight, PIT tag code, mesohabitat, water depth, substrate, <br />and cover) on rare fish captured will be recorded. All large~bodied native fish (i.e., <br />flannelmouth and bluehead suckers) will be weighed, measured, and released. All other <br /> <br />" ,~ <br />tff <br />L1 <br /> <br />Work Plan FY99.wpd <br /> <br />19 <br /> <br />Budget and Work Plan FY99 <br />