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3y Table 13. Percentage composition of fishes collected within generalized habitats sampled in the Yampa River trend zone, flaybell to Sunbeam, and special sites, Hot Juniper Springs (Y2J), the base of Cross Mountain Canyon (NA), and the pool about 3 km brlow Cross Mountain Canyon (Y4). Colorado, 27 through 31 July 1977. Habitat a: Backwater Pool Shoreline Chute Riffle Run Backwater 6 Channel Shoreline Water Temperatures (C): 23 22-27 21-26 25 23-26 20-25 20-32 Collection Sites Included b: D,E,Y2J C,H A,F,G 8 B,E.G D,F.H,Y2J A.8,C,D,E,F,G Y2J,Y4,Y4A Length Group (mm TL)c: < 20 < < 20 < < 20 < < 20 < < 20 < < 20 < < 20 < Total Fish Tabulated 104 1737 - 144 312 1379 - 139 - 204 - 513 1986 1022 S Composition d: Presopium williamsoni - - _ _ - - - _ - - C rinus carpio 1 5 - 10 1 19 - 58 - - - ? * 1 Gila robusta 1 8 - 16 1 5 - 2 - 2 - 5 1 21 Notropis stramineus - 3 - - 8 20 - 24 - 1 - 6 9 2 Pimephales promelus 62 23 - 1 83 9 - 11 - 1 - 10 65 9 Rhinichthys osculus 26 78 - 10 6 17 - - - 38 - 44 8 16 Richardsonius balteatus 2 3 - 3 1 2 - - - 8 - 9 14 5 R. balteatus x R. osculus - - - - - - _ _ • - _ - Catostomus comrersoni 1 1 - 1 _ 2 1 _ 4 _ 1 Catustunws discobolus 8 9 - 1 • 4 - 1 - 3 - 10 1 16 Catostomus latipinnis - 29 - 58 * 23 - 3 - 43 - 9 - 26 C. comnersoni x C. discoboluse - - - - - - - - - - - 1 - C. comnersoni x C. latipinnise - 1 - - - - - - - - * - 1 Ictalurus melas Fundulus kansae - - - - - - - 1 - - - - 1 2 Cottus bairdi - - - 1 - 1 - - - + 1 - - a. See text for descriptions of habitat types. Most samples were contaminated with specimens from habitats adjacent to the target habitat. Those in which such contamination was great or target habitats were intentionally combined are net tabulated; however, because of the large numbers of samples involved (most dip net and some seine collections) and similarity of some characteristics such as water velocity, the combined backwater and shoreline collections are given as a separate category and include only those which could not be designated as either back- water or shoreline. b. See maps included in this report for location of collection sites; only sites from which pertinent samples are included in this table are designated. C. Larvae and juveniles less than or equal to 20 mm TL (520) were probably spawned within about five weeks of the date of collection. Specimens greater than 20 mm TL (20<) include older larvae and younger-of-the year juveniles as well as older juveniles and adults. d, * ¦ < 0.5%; - = no specimens collected. e. The identity of the smaller specimens as catostomid hybrids is tentative. In addition, a few of the smaller specimens identified as pure species may in fact be hybrids.