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buildings and fed throughout the winter so that they will continue to grow and achieve the 150 mm TL requirement quicker. Ta in .-All stocked fish will be PIT-tagged to better evaluate the stocking plan and its various aspects (e.g., survival, growth, stocking location, and lot survival evaluation). The cost would be approximately $10,050 to PIT-tag a total of 2,680 Colorado pikeminnow, which would occur in the autumn after a full. year of growth. RAZORBACK SUCKER Background The only remaining riverine population of razorback sucker in the Upper Colorado River Basin exists in the middle Green River, with an estimated population of less than 500 adults. Stocking of individuals in this population has mainly been through excess brood fish. Other stockings included larval and juvenile razorback sucker into flooded bottomlands. Some of these stocked fish have shown up on the spawning bar during the spawning period and juveniles in -- wetlands had significant growth and survival demonstrating success in the stocking programs. Experimental stocking of razorback sucker has occurred in the upper Colorado River (including the Gunnison River) since 1996 (Burdick 1995). Limited information is available as to the success of that stocking. For instance, one razorback sucker that was stocked in 1996 used the Redlands Fish Ladder on the Gunnison River this past summer. Four others stocked this spring also passed through the ladder this summer. The successful spawning and recruitment by these stocked fish have not yet been documented. The State of Colorado stocking plan requires razorback sucker to be greater than 300 mm (12 inches) TL and the State of Utah stocking plan requires razorback sucker that average 300 mm (12 inches) TL. Razorback sucker that are 300 mm TL average in weight around 250 g (8.8 ounces). The State of Colorado stocking plan requires annual stocking of 16,440 razorback sucker. These fish can all be produced at the Grand Valley facility with associated local grow- out ponds throughout the Grand Valley area. The State of Utah stocking plan requires annual stocking of 18,500 razorback sucker. These fish can all be produced at the Ouray National Fish