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Hatchery, Ouray, Utah (Ouray) with associated locally leased grow-out ponds throughout the Uintah Basin. .Approach Broodstock: In the upper Colorado River, a variety of fish from the Green, Colorado and Gunnison rivers, and both the Colorado River and San Juan River arms of Lake Powell, have been used to produce razorback sucker for stocking plans in both the Colorado and San Juan rivers. A breeding matrix that follows the genetic guidelines is used to maintain genetic diversity and reduce inbreeding. In the Green River, the Recovery Program has developed 25 lots from 25 male x 25 female parents to maintain the genetic diversity. These will be used in a breeding matrix in order to develop Fi fish for augmentation. ,Rearing Location Prior to Stocking_(see Table 2).-In the Upper Colorado River, razorback sucker are raised intensively in 4-foot and 8-foot diameter tanks at the 24 Road hatchery building for the first season and are distributed to a variety of grow-out ponds in the spring after the first year. Assuming that these grow-out ponds can produce 500 pounds of fish per acre, 18.1 acres are required on annual basis to produce 16,440 razorback sucker that are greater than 300 mm TL and weigh about 250 g. Since this size is normally achieved by the third growing season, twice as much acreage is required to meet the two years of growth (i.e., 36.2 acres). The Recovery Program currently has approximately 98 acres of grow-out ponds throughout the Grand Valley area. In the past, razorback sucker at Ouray have been raised extensively in 0.2-acre hatchery ponds during the first season of growth. The Ouray facility is being modified to have a water re- use system for the inside culture during the first calender year. Assuming hatchery ponds can produce 1,000 pounds offish per acre, 5.0 acres of hatchery ponds could be used for the second year of growth, and the ponds would yield 9,100 razorback sucker that are greater than 300 mm TL and weigh about 250 g: An additional 10.4 acres of leased grow-out ponds that produce 500 pounds of fish per acre, would yield 9,400 razorback sucker that are greater than 300 mm TL and weigh about 250 g. The combination of using hatchery and leased grow-out ponds would yield 18,500 to meet the State of Utah stocking plan requirement. Because fish of this size are normally achieved by the third growing season, the fish may have to be held a third growing 6