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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />reach section described for the fish sampling. Aerial photos were qualitatively used to <br />compare habitat availability in the surveyed study sites to longer sections of the river. <br />The images of the sites were rectified using ground control points and the Imagine <br />software package. These images were then registered in the Surface Modeling Software <br />(SMS) and were used for reference in creating the finite element mesh. <br /> <br />RESULTS <br /> <br />FISH SAMPLES <br /> <br />Species Composition <br /> <br />Percentages of fish captured by electrofishing, included fish less than 15 cm <br />(YOY, and smaller species; speckled dace Rhinichthys osculus, mottled sculpin Cottus <br />bairdi, sand shiners Notropis stramineus, fathead minnows Pimephales promelas, brook <br />stickleback Culaea,inconstans, redside shiner Richardsonius balteatus and green sunfish <br />Lepomis cyanellus). This information is given in Appendix 1 Table Al.l. <br /> <br />White sucker Catostomus commersoni hybrids were common at both stations and <br />for certain reporting purposes were grouped with those that appeared to be pure white <br />suckers. The white-cross grouping, referred to as WSwx, represents both apparent <br />pure white and white sucker hybrids. White sucker hybrids comprised at least 50% of <br />the WSWX group at both Sevens and Duffy (Table Al.2). <br /> <br />For fish over 15 cm, flannel mouth sucker Catostomus latipinnis was the most <br />common species in the Representative Reach (RR) at the Sevens station. Flannelmouth <br />sucker comprised 43% of the total fish caught but was 37% based on density estimates <br />(Table 1). In the shorter surveyed site (SS) the most common species were <br />flannel mouth sucker and WSWX at 28% each (Table 1). The SS site had more WSWX <br />than the RR station (17%), but less bluehead sucker Catostomus discobolus (14%) than <br />the RR station (27%)(Table 1). Roundtail chub Gila robust a and other species had <br />higher percentages in the SS site. There appeared to be a higher composition of "pool" <br />associated species in the SS site and a lower representation of run (flannel mouth sucker) <br />and riffle (bluehead sucker) species in the SS site than in the longer RR station. <br /> <br />At Duffy Tunnel, WSWX comprised 67% of the fish caught over 15 cm (Table <br />2). WSWX composition was 59% in the RR station based 'on density estimates, <br />compared to 63% in the SS sites. Small mouth bass Micropterus dolomieu composition <br />was somewhat higher at the SS site 13% than in the longer RR station where it was 11% <br />(Table 2). Flannelmouth sucker was lower in the SS site (3.9%) than the RR station <br />(7.4%), while bluehead suckers were very similar between the two lo~tions (4.6 % vs. <br />5.0%). Roundtail chub composition was a little less in the SS site (2.5%) than in the <br />long RR (3.8%). Species composition was more similar between the SS site and the RR <br />at Duffy Tunnel than at the Sevens station. <br /> <br />9 <br />