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...... -- I q ~ 5 C~ ~ f; t ~ a L 07CP Gha.r-t ~&<j~,("6~ )ct'36 The Impact of Taylor Draw Darn' and Kenney Reservoir on the Fishes of the White River Thanas Chart and Eric Bergersen Colorado Cooperative Fish and Wildlife Research Unit Colorado State University Fort Collins 1 Colorado 80523 Patrick ~~inez Colorado Division of Wildlife 711 Independent Avenue Grand J'llllction, Colorado 81505 ABSTRACl' Taylor Draw Project personnel are engaged in the final season of a three year study investigating impacts of Taylor Draw Darn developnent and operation on White River fishes, particularly Colorado squawfish (Ptychocheilus lucius) classified as endangered on federal and Colorado lists. The mainstem dam, designed with hypolimnetic release, was canpleted. and began immdating Kenney Reservoir basin in October 1985. The White River fran the Yellow Creek Confluence to the Colorado/Utah state line (45 kIn above to 51 kIn below the dam axis) has been sampled for Colorado squawfish by electrofishing. ~bre inten- sive fish s,unpling has been conducted in the 8 km above and the 8 kIn below the reservoir basin. larval' fish have been sampled from 24 kIn above the dmn to the stateline. Thirteen fish species have been collected (seven native, sbc non- nati ve) with six species represented in' larval samples (four native 1 two non- native); however, no larval squawfish have been found. A total of 23 adult and juvenile Colorado squawfish were captured prior to impoundment in 1983 (11) and 1984 (12) of which four and five, respectively, were surgically implanted. with radiotransmitters. Radiotelane1:ry shows lIDvanent down the White River with several indi victuals lIDving up the Green River. One specirren, radiotagged in 1983, was lIDnitored and recaptured in the Yampa River in 1984. Pre-impound- rrent electrofishing samples in 1983 and 1984 above and below the dam axis were daninated by native flannelIrouth suckers (Catostams latipinnis), roundtail chubs (Gila robusta), and bluehead ~llckers (C. discobolus) in order of abun- dance. Initial 1985 post-impoundment electrofishing below the dam shows dani- nance by recently stocked rainbow trout (SalIro gairclneri), and an increased abundance of bluehead. suckers and rountail chubs. Non-native red shiners (Notropis lutrensis) and fathead minnO\vs (Pi..rrephelas pranelas) , comprising small percentages in 1983 and 1984 pre-impoundment seine samples, dc.:minate 1985 shallow water collections below the dam. . ~bvements of non-endangered fishes _230 mn TL has been studied by tagging over 3000 fish representing fi ve species. Recaptures indicate low net lIDvement suggesting an affinity for a hane range. \ 145 ffO(, ltv. A~5iX (.16 ~~q~. 6l;; (IQg5')