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', .. ,~ 4 from the confluence with the Yampa River in T. 1 N., R. ]03 W., section 28 (6th Principal Meridian) to the confluence with the Colorado River in T. 30 S., R. 19 E., section 7 (Salt Lake Meridian). Colorado. Rio Blanco Countv: and Utah. Uintah Countv. The .White River and its 100-year floodplain from Rio Blanco Lake Dam in T. 1 N., R. 96 W., section 6 (6th Principal Meridian) to the confluence with the Green River in T. 9 S., R. 20 E., section 4 (Salt Lake Meridian). Colorado. Delta and Mesa Counties. The Gunnison River and its 100-year floodplain from the confluence with the Uncompahgre River in T. 15 S., R. 96 W., section 11 (6th Principal Meridian) to the confluence with the Colorado River in T. 1 S., R. 1 W., section 22 (Ute Meridian). ana ~arrieia ~ount~es. ine ~oioraao never ana its tuu-year riooapiain from the Colorado River Bridge at exit 90 north off Interstate 70 in T. 6 S., R. 93 W., section 16 (6th Principal Meridian) to North Wash, including the Dirty Devil arm of Lake Powell up to the full pool elevation, in T. 33 S., R. 14 E., section 29 (Salt Lake Meridian). New Mexico. San Juan Countv: and Utah. San Juan Countv. The San Juan River and its 100-year floodplain from the State Route 371 Bridge in T. 29 N., R. 13 W., section 17 (New Mexico Meridian) to Neskahai Canyon in the San Juan arm of Lake Powell in T. 41 S., 11 E., section 26 (Salt Lake Meridian) up to the full pool elevation. Bioloa The life-history phases that appear to be most critical for the Colorado squawfish include spawning, egg fertilization, and development of larvae through the first year of life. These phases of Colorado squawfish development are tied closely to specific habitat requirements. Natural spawning of Colorado squawfish is initiated on the descending ]imb of the annual hydrograph as water temperatures approach 20 'C. Spawning, both in the hatchery and in the field, generally occurs in a 2-month timeframe between July I and September I, although high flow water years may suppress river temperatures and extend spawning in the natural system into September. Conversely, during low flow years when the water warms earlier, spawning may occur in late June. Temperature also has an effect on egg development and hatching. In the laboratory, egg mortality was 100 percent in a controlled test at 13 'C. At 16 'C to 18 'C, development of the egg is slightly retarded, but hatching success and survival of larvae was higher. At 20 'C to 26 'C, development and survival through the larval stage was up to 59 percent (Hammon 1981). Juvenile temperature preference tests showed that preferred temperatures ranged from 21.9 'C to 27.6 'C. The most preferred temperature for juveniles and adults was estimated to be 24.6 'C. Temperatures near 24 'C are also needed for optimal development and growth of young (Miller et al. 1982).