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<br />J <br /> <br />and reproductive strategy of the Colorado squawfish, These studies have <br /> <br />led to preliminary revisions regarding hypotheses presented by Vanicek <br /> <br />and Kramer (1969), Seethaler et aI, (1976), Holden (1977, 1980), Seethaler <br />(1978), Joseph et aI, (1977), and Behnke and Benson (1980) on the <br />distribution of successfully reproducing Colorado squawfish populations, <br /> <br />habitat requirements and the general ecology of this endangered species, <br /> <br />The purpose of this study was to collect data on prespawning, <br /> <br />spawning and postspawning movements of Colorado squawfish in the Yampa <br /> <br />River (Fig, 1) and to expand the findings of previous studies. In <br />addition to movement patterns and habitat utilization, temperature <br /> <br />preferences of the Colorado squawfish were investigated, <br /> <br />METHODS <br /> <br />Radiotelemetry <br /> <br />Twelve Colorado squawfish, greater than 550 millimeter (mm) total <br /> <br />length (TLl, were collected from the Yampa River during March and April, <br /> <br />1982, for radiotransmitter implantation, Collections were made during <br /> <br />these months when cool water temperatures minimlzed the chances of <br /> <br />infection due to field surgical procedures, Six fish were collected <br /> <br />above Juniper Springs Canyon river kID 146,4 (mile 91), J above Cross <br /> <br />Mountain Canyon river kID 93,3 (mile 58) and 3 below Cross Mountain <br /> <br /> <br />Canyon river kID 85,3 (mile 53) using electrofishing gear and experimental <br /> <br /> <br />gill nets as described by Wick et aI, (1981), <br /> <br /> <br />Electrofishing efforts were continued until July 8, 1982, from <br /> <br /> <br />river kID 177 to 72,4 (mile 109.9-45), This extended sampling was <br /> <br /> <br />conducted in preferred habitats, indicated by the presence of radiotagged <br /> <br /> <br />squawfish, to verify habitat preference data and to provide additional <br />