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52 <br />Speckled Dace (Rhinichthys osculus) <br />The speckled dace is widely distributed in major streams and desert <br />springs in Utah and other parts of the interior West. Its great abundance, <br />small size, and wide distribution make it readily available as a forage fish. <br />The speckled dace generally does not reach a length greater than 2 in (5 cm) <br />to 3 in (8 cm), but individuals up to 4 in (10 cm) have been captured (Sigler <br />and Miller, 1963). Two year classes were apparent during the sampling dates <br />(Figure 25). Each group increased in length 10 to 15 mm between sampling <br />dates. <br />The dace lives in a variety of habitats from swift, cold riffles of <br />mountain streams to large, turbid, warm rivers. In the White River, dace <br />were commonly found in water less than 1 m deep and in riffle areas where <br />a rubble covered bottom was present. <br />Flannelmouth Sucker (Catostomus latipinnis) <br />The flannelmouth is confined to but common in the Colorado River basin. <br />The large fleshy lobes of the lower lips distinguish this species from other <br />suckers. It spawns during the summer in the upper Colorado basin and is <br />known to hybridize with the humpback (Figure 23) and other suckers (Hubbs and <br />Miller, 1953). Adults reach about 20 in (52 cm) in length. Analysis of <br />length data on 341 flannelmouths collected in September, 1978 revealed a <br />large age group, 26 to 60 mm in length (Figure 26a). Based on data presented <br />by McAda (1977) for flannelmouth in the Green River, fish in this large length <br />group were probably young-of-the-year. The results of the 1979 spring sampling <br />indicate this age group grew slightly over the winter to 35-70 mm (Figure 26b). <br />The large flannelmouth suckers captured or observed during the spring (Nay-June) <br />sampling were usually near-or in shallow (2 ft (:66m]) sandbar areas. Their <br />ripe condition, indicated by tubercles on males and the expression of sex products