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• 4 <br />from the confluence with the Yampa River in T. 7 N., R. 103 W., <br />section 28 (6th Principal Meridian) to the confluence with the Colorado <br />River in T. 30 S., R. 19 E., section 7 (Salt Lake Meridian). <br />Colorado. Rio Blanco County: and Utah. Uintah County. The .White River <br />and its 100-year floodplain from Rio Blanco Lake Dam in T. 1 N., <br />R. 96 W., section 6 (6th Principal Meridian) to the confluence with the <br />Green River in T. 9 S., R. 20 E., section 4 (Salt Lake Meridian). <br />Colorado, Delta and Mesa Counties. The Gunnison River and its 100-year <br />floodplain from the confluence with the Uncompahgre River in T. 15 S., <br />R. 96 W., section 11 (6th Principal Meridian) to the confluence with the <br />Colorado River in T. 1 S., R. 1 W., section 22 (Ute Meridian). <br />and Garfield Counties. The Colorado River and its 100-year floodplain <br />from the Colorado River Bridge at exit 90 north off Interstate 70 in <br />T. 6 S., R. 93 W., section 16 (6th Principal Meridian) to North Wash, <br />including the Dirty Devil arm of Lake Powell up to the full pool <br />elevation, in T. 33 S., R. 14 E., section 29 (Salt Lake Meridian). <br />New Mexico. San Juan County: and Utah. San Juan County. The San Juan <br />River and its 100-year floodplain from the State Route 371 Bridge in <br />T. 29 N., R. 13 W., section 17 (New Mexico Meridian) to Neskahai Canyon <br />• in the San Juan arm of Lake Powell in T. 41 S., 11 E., section 26 (Salt <br />Lake Meridian) up to the full pool elevation. <br />Bioloov <br />The life-history phases that appear to be most critical for the Colorado <br />squawfish include spawning, egg fertilization, and development of larvae <br />through the first year of life. These phases of Colorado squawfish <br />development are tied closely to specific habitat requirements. Natural <br />spawning of Colorado squawfish is initiated on the descending limb of the <br />annual hydrograph as water temperatures approach 20 °C. Spawning, both in the <br />hatchery and in the field, generally occurs in a 2-month timeframe between <br />July 1 and September 1, although high flow water years may suppress river <br />temperatures and extend spawning in the natural system into September. <br />Conversely, during low flow years when the water warms earlier, spawning may <br />occur in late June. <br />Temperature also has an effect on egg development and hatching. In the <br />laboratory, egg mortality was 100 percent in a controlled test at 13 °C. At <br />16 'C to 18 'C, development of the egg is slightly retarded, but hatching <br />success and survival of larvae was higher. At 20 °C to 26 °C, development and <br />survival through the larval stage was up to 59 percent (Hammon 1981). <br />Juvenile temperature preference tests showed that preferred temperatures <br />ranged from 21.9 °C to 27.6 'C. The most preferred temperature for juveniles <br />and adults was estimated to be 24.6 °C. Temperatures near 24 °C are also <br />needed for optimal development and growth of young (Miller et al. 1982). <br />• <br />