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17 <br />A radiotelemetry study of Colorado squawfish incorporating <br />diel components was inconclusive, but appeared to indicate <br />increased movement at night during spawning periods near spawning <br />sites (Miller et al. 1983). Anglers fishing at night during <br />spawning migrations in June and July may be more likely to catch <br />squawfish. The increase in squawfish movement, during migrations <br />may lead to more frequent encounters with squawfish, since the <br />creel clerks reported that anglers repeatedly fished in the same <br />location. <br />However, during pre- and post-spawning periods movement was <br />greatest during the day, from 0800 hours to 1600 hours. More <br />recent work on the three Gila sp. in these rivers suggests <br />greater movement of these fishes during crepuscular periods <br />(Chart 1992; Richard Valdez Bio/West, personal communication). <br />Chances of catching these species may be increased during <br />crepuscular periods. <br />An estimate has been made of the population of adult <br />squawfish in the Colorado River in the Grand Valley area (RK 212- <br />298) of "=12 fish/mile" in the Interim Recovery Objectives (IRO) <br />proposed by the Colorado Division of Wildlife (CDOW 1992). <br />However, this estimate cannot be directly transferred to the <br />Green and Colorado rivers in Utah. <br />For comparison, the Interagency Standardized Monitoring <br />Program (ISMP) sampling from 1986-1990 (Bates et. al. 1991; <br />Cranney 1991; USFWS 1991) traditionally produced fewer adult <br />