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78 <br />The introduced white sucker was reported as abundant <br />in the upper Yampa and rare in the lower Yampa in Holden <br />and Stalnaker's paper. Jordan (1891) did not report white <br />suckers in the upper Colorado River basin. White suckers <br />were present in the South Mesa Lake country in Colorado by <br />1930 and were thought to have arrived as baitfish around <br />1926 (Hubbs et al 1943). <br />Hybridization studies by Hubbs and his associates in <br />the early 1940's reported all catostomid hybrids mentioned <br />in this study except the flannelmouth X white sucker <br />cross (Hubbs et al 1943, Hubbs and Hubbs 1947). This <br />hybrid was reported by Holden and Stalnaker (1975) in the <br />Yampa River and by Baxter and Simon (1970) in Big Savery <br />Creek, Wyoming. Holden and Stalnaker (1975) found bluehead <br />X white sucker hybrids in large numbers in the upper Yampa <br />River but indicated that they were less abundant downstream <br />and absent in all other areas of the drainage studied. <br />Hubbs et al (1943) noticed high numbers of this hybrid <br />relative to numbers of parental types in two western Colorado <br />streams. All specimens examined in their study were less <br />than 128 mm in total length. <br />Bluehead X flannelmouth sucker hybrids were described <br />by Hubbs and Hubbs (1947). Their abundance was notably low <br />in comparison to that of parental fish sampled in the same <br />area. The specimens were collected in one instance from a <br />beaver pond complex in which the flannelmouth sucker was <br />probably not favored. The other specimens came from a lotic