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., -( 26 UTAH ACADEMY PROCEEDINGS. VOL. SO,PART I, 1973 Purpose After a review of Ihe Green River Fish Manipulation Program by the Secretary of the Interior, Stewart L. Udall, in March 1963, the Utah Cooperative Fishery Unit was requested"to determine the extent of species and populatIon impairnient caused by the rotenone and to plan a longer range research project which would assess the changes in habitat and fish populations in Dinosaur National Monument brought about by closure of Flaming Gorge Dam. The objectives of this specific phase of the follow-up study were: 1. To describe changes in river environm~nt associated with the closure of Flaming Gorge Dam. 2. To determine species composition, distribution, and abundance of ::..::: :.:. ;. .' fhhcs in the Grecn River from Flaming Gorge Dam to Ouray, Utah -. '. ;. (a distance of 166 river miles). :-;:::~_ ~" =~::. 3. To compare poslimpoundment distributi~n of fishes with that reo . -'.; . _. c. ,.. ported in preimpoundment collections. f:-....;.....< .. _ Field studies were begun in the summer of 1963 by Utah Cooperative c:i': .:::;,-' Fishery Ullit personnel and terminated in the faII of 1966. :~"'. c.; :-.' :-. - Beginning in the summer of 1968 and continuing to the present, !-.'1':....: ':," .emphasis was placed upon the entire.upper Green River system, attempt- ;--.> :'. . . .- ing to detcrmine the distribution and abundance of the indigenous fish h::~::::. . species found in the mainstcm Green River and its major tributaries. :':. :."::;':: _:. Primarily as a result of these efforts, extensive collections have been made .... ~:. th!oughout the Green River basin. r.~:_:::..-. ::.~ ...~ ,.... . ~. ..........- ...:. ^. -~... .... - , . SpeCies Accounts , - -...... . - ... ............... .... - .. ; :::.:~~ ;" :', - We are rest ricting tltis discussion to seven indigenous species which were 1 (''': ~'. -: c:ommon to the large main-stem rivers of.the upper Colorado basin. \'ci.~ ;b: :~.. .'These seven species are: ~','::. : ~ - . Colorado squawtish Prycllocheillls IlIeius '. '" _c -.. · . Roundtail chub Gila robusra ,r,c'.:,',... Bony tail chub Gila elegalls :;. the ;':-.,...~~ ;- Humpback chub Gila cypl:a :-;. \" --:.' .,.7,..~. Humpback sucker Xyrallchen rexallllS ;x"rc:;'~: :~: c Dluehead sucker Carosromus discobolus It:~ ~.;:-:-: - Flannelmouth sucker Carosromus laripillllis :,"," .~-::.:.:- : The humpback chub and the Colorado squawfish are presently include&.l :~ ;,::-:-:. :'tn-the list of "rare and endangered" species as compiled by the U.S. ;;~ :~::::.: Department of the Interior(USDI,1968). '';' ':"".~. /' ,~,..'" '-.