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Biomass data for the Colorado River was also examined as a function mean depth <br />and velocity from the electro-fishing done along the shoreline. Shoreline sampling was <br />done in 2000 and 2001 to determine species composition of the shoreline habitats. <br />Shoreline habitats are typically shallow and low velocity and very adult flannelmouth and <br />bluehead sucker were captured from shoreline habitats. The shoreline electro-fishing <br />results were similar to the criteria for Unusable habitat determined by the Sigma Polt <br />analysis. <br />Figure 6. Example of digitized polygons or electro-fishing areas (photo of Clifton site). <br />DETERMINATION OF HABITAT AVAILABILITY <br />Once meso-habitat biomass (suitability) criteria for each species of interest were <br />determined, habitat surface area for each of the four meso-habitat types (Unusable, <br />unsuitable, marginal and optimal) was calculated with ArcInfo using the same process as <br />described for the 16-meso habitat types. The surface area of unusable, unsuitable, <br />marginal and optimal habitat was multiplied by the observed mean biomass to give a <br />biomass estimate for both bluehead and flannelmouth suckers for each of the simulated <br />flows. <br />33 <br />0.6 0 0.6 1.2 Miles <br />