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I I I I I I I I I I I I I I I I I I I UV light which destroys micro-organisms, reduces total organic carbon, and removes ozone from the water. The water completes the reconditioning process by passing through one more packed column and into a holding tank, where it is pumped back out to the fish. If the water stops circulating due to mechanical problems or a power failure, two things happen. First, a back-up oxygen delivery system turns on and supplies oxygen to the tanks, and will stay on until the problem is corrected. Second, the alarm system begins to phone staff until someone responds and corrects the failure. Daily, 1000 gallons of water are drained from the surge tank and 1000 gallons from the make-up tanks are added. The make-up tanks are two pairs of 500 gallon tanks. Each set of make-up tanks is filled and dumped into the system on alternating days. The make-up water from the Ute Water Conservancy District is cWorinated and must be treated with sodium thiosulfate to remove the cWorine before being added to the system. DecWorination and other water treatments (e.g., adding salt or sodium bicarbonate to alter water chemistry) are done in the make-up tanks. CLYMER'S GROW-OUT POND Clymer's Grow-out Pond is owned by the Bureau of Reclamation and is located on a wildlife mitigation area near the confluence of the Gunnison and Colorado Rivers (Figure 4). The pond was drained in 1996 to remove nonnative fish, construct a collection kettle, and shape the bottom of the pond so that it would drain efficiently. The pond is approximately 5 acres in size and two wetlands were constructed next to the shore for local wildlife. Water is diverted into the pond from the Gunnison River through the Redlands Water and Power Canal and is run through a 3/8- in-mesh screen to reduce the potential for nonnative fish introduction. RESULTS AND DISCUSSION HORSETHIEF REFUGIA PONDS Since construction was finished in 1992, Horsethief has held four species of Colorado River native endangered fish. The facility currently holds 257 razorback suckers, 150 Colorado squawfish, 60 humpback chubs, and 4 bonytail (Table 1). Colorado River endangered fish have been transferred to the facility from various places. A chronology of activities at the Refugia Ponds follows: -7-