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<br />002787 <br /> <br />levels in the incoming river water and in all ponds. Since the aerators were installed, nitrogen <br />supersaturation and gas bubble disease have not been a problem. (U.S. Fish and Wildlife Service <br />1995a) <br /> <br />During 1996, a rearing facility was leased, a garage-style building constructed, and off-channel <br />ponds modified for use as grow-out facilities (U.S. Fish and Wildlife Service 1995c). A growout <br />pond at the confluence of the Colorado and Gunnison Rivers was converted from an existing 5 acre <br />gravel pit type pond. The pond was drained, the bottom sloped, and a fish trap installed. The pond <br />will be used as a growout facility for restoration stocking of razorback sucker in the ongoing <br />evaluation of survival related to size of fish at release (Wydoski 1996b). Additional riverside ponds <br />will be modified to have sloping bottoms and fish traps during FY 97 (U.S. Fish and Wildlife Service <br />1996a). <br /> <br />The Grand Valley Endangered Fish Facility is used for intensive culture activities. It includes a <br />building with a total of 30 4-foot fiberglass tanks and 6 8-foot fiberglass tanks. <br /> <br />The propagation facilities developed or planned at Horsethiefthrough FY 97 is shown in Table 5.3-2. <br /> <br />Table 5.3-2 Summary of Propagation Facilities Development at Horsethief State Wildlife <br />Area <br /> <br /> Ponds: Total <br />Year # Size .Acres Other Facilities <br />1992 4 0.75 3.0 <br /> 2 0.25 0.5 <br />1993 Vegetated pond slopes, installed small pump at outside <br /> kettle <br />1994 Installed aerators, installed saturometer to monitor <br /> nitrogen levels <br />1995 <br />1996 1 (a) 5.0 5.0 Constructed garage style building, modified off-channel <br /> ponds for use as grow""ut facilities <br />1997 Additional riverside ponds will be modified for use as <br /> grow""ut facilities <br />TOTALS 7 8.5 <br /> <br />Note: a. Growout pond located at the confluence of the Colorado and Gunnison Rivers converted from <br />an existing 5 acre gravel pit pond <br /> <br />Grand Valley Endangered Fish Facility and Horsethief SW A remain the primary refuge for Upper <br />Colorado River subbasin razorback sucker and the backup refuge for Colorado squawfish, bonytail <br />chub, and humpback chub. The expenditures by the Recovery Program for construction and research <br />facilities at HorsethiefSWA through FY 97 total approximately $1,050,000. <br /> <br />27 <br />