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apparent widespread distribution of Colorado squawfish (relative to other rare <br />and endangered fishes) in the upper basin. Therefore, the CRFMP study <br />emphasized the biology of Colorado squawfish. (Note: more recent studies <br />initiated in 1986 consider all species separately.) <br />NP5 initiated several studies (physical and biological) in Spring 1983 in <br />Dinosaur National Monument (DNM). Division of Ecological Services and the <br />Vernal Field Station (FWS) participated in this interagency effort. A report <br />prepared in 1983 (Archer and Tyus 1984) provided data obtained by the Vernal <br />study, and summarized 1981 and 1982 FWS studies in DNM. Study objectives <br />included locating 1983 spawning areas for the Colorado squawfish, obtaining <br />habitat preference data using radiotelemetry, incorporating these data into a <br />physical habitat simulation model (PNABSIM), and demonstrating spawning <br />suttees by collecting ripe Colorado squawfish. <br />In July 1984, the FWS, BR, and states of Colorado, Utah, and Wyoming <br />signed a memorandum of understanding creating an Upper Colorado River Basin <br />Coordinating Committee (UCRBCC) in which Federal, State and Private agencies <br />agreed to cooperate in investigating alternatives for water development that <br />would afford protection for the endangered Colorado River fishes. A separate <br />Biology Subcommittee was created to review available data concerning the <br />distribution and statue of the rate fishes, including razorback sucker. FWS <br />(Grand Junction and Vernal stations), Colorado Division of Wildlife (CROW), <br />and Utah Division of Wildlife Resaucces (UDWR) cooperated to produce a <br />sensitive areas document for use in management planning and decision making. <br />This report presented geographic habitat usage by Colorado squawfish, humpback <br />chub~and razorback sucker. The bonytail was not treated for lack of available <br />data. <br />3 <br />