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<br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />INTRODUCTION <br /> <br />Very little .is known about Colorado squawfish (Ptychocheilus lucius) <br />spawning requirements. A number of studies have been undertaken in the Colorado <br />Basin that, at least in part, attempted to locate spawning fish; none have been <br />successful (Vanicek, 1967; Holden, 1973; Prewitt and Carlson, 1975; Seethaler, <br />McAda, and Wydoski, 1976; Kidd, 1977). Most of these studies consisted of at- <br />tempting to locate fish in areas of suspected concentration during spawning time <br />and used conventional fish collecting gear, usually entanglement nets and/or <br />electrofishing equipment. These studies suggested that attempts to locate spawn- <br />ing sites with conventional gear has a low cost/benefit value. Seethaler, McAda, <br />and Wydoski (1976) used ultrasonic tags on adult squawfish, but were unable to <br />follow the tagged fish because the signal was displaced by the current of the <br />river. This report details an attempt to locate Colorado squawfish spawning <br />areas with the use of radio transmitters abdominally implanted in adult fish. <br />