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<br />Larval fish will be collected with light traps coincident with the high flow period. Biweekly <br />sampling of each site will be maintained following peak flows and continue until terrace habitats <br />have been dewatered. Following dewatering of terrace habitats sampling will continue on a <br />monthly basis in any depression habitats containing water and the main channel in habitats <br />adjacent to designated sites. Fish collections will be made with an electroshocker, trammel nets, <br />tyke nets, and seines. Totallen!,'ths will be recorded fTom all fish. <br /> <br />Nonnative Species. The study design is structured to measure the response of the entire <br />nonnative fish community through target species. The target species include centrarchids, <br />cyprinids, channel catfish, and northern pike (Table 2). These target species were selected <br />because they are known to have detrimental effects on the endangered fishes and/or they are in <br />high concentrations through out reaches in the Upper Colorado River Basin. The study design is <br />presented in Table 2. Generally, the sampling design was stratified into the various species, life <br />stages, and available habitats. It is sequenced both spatially and temporally. We envision that <br />different techniques and efforts will be required to monitor and evaluate the native and nonnative <br />species response. The sampling, design, therefore, has been stratified to focuses effons between <br />the different community components. Specifically, we envision that different intensities (weekly <br />sampling for nonnative species versus biweekly sampling for native species) and different gear <br />types (light traps for native species versus dip nets, small mesh seines, etc) will de used. <br /> <br />Fish Food Organisms. Biweekly sampling will be implemented to establish the quantity and <br />diversity of macroinvertebrates occurring in natural and application floodplain wetlands. In <br />addition, water quality parameters that effect these organisms will be measured from weekly <br />water samples using an autoanalyzer, and other water quality parameters will be measured using <br />Hydrolabs. <br /> <br />Phvsical Parameters and Vegetation. Physical and vegetative descriptions of natural and <br />application sites will be made at each site visit for fish sampling. These parameters will generally <br />not be made in the river main channel. In addition to the above listed parameters we envision that <br />different techniques will be required to breach or remove levees at different sites. We will rely on <br />the geomorphology/hydrology support project within the Habitat Restoration Program to evaluate <br />those different techniques for effectiveness. <br /> <br />Contaminants. Contaminant sampling will be made at each location at the same frequency as fish <br />sampling. <br /> <br />16 <br />