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4 On March 5, 1979 the Division of Wildlife and the U.S. Fish and Wildlife Service met again to review the three engineering designs and select the best one for further work. The details of the hatching house and pond layout were also reviewed. Final approval is pending. The hatching house hopefully will provide an environment conducive to survival and spawning of fry and fingerlings. It includes several features requiring advanced fish culture and engineering technology. As water enters the hatching house from the settling pond or the existing trout hatchery source, it will be passed through an ultraviolet filter`to kill potential pathogens. A water pump will push water through the system at a flow up to 225 gallons per minute. A water heater will be used to increase water temperature to approximately 70 to 750 F (This will be a research item) because the incoming water will seldom be warmer than 550 F. By recirculating the heated water at a rate of 90 percent recirculated and 10 percent fresh water, it will be possible to significantly reduce heating costs. The energy source will either be electrical, propane or solar powered but in any case will have a back-up power source. Particulate material will be removed when the water passes through a settling basin. Additionally, the water will pass through a denitrifying filter to reduce toxic ammonia waste products. Aerators will be used to restore dissolved oxygen to saturation and eliminate possible gas bubble disease caused by supersaturated nitrogen. Holding facilities include two indoor raceways for brood stock spawning and six small troughs to incubate eggs and rear fry. A small storage area is also included. Production raceways and ponds, the quarantine facility, and the broodstock overwintering pond will be located outdoors. In the raceways, it will be possible to rear fingerling squawfish and conduct diet, growth and survival experiments. Similar experiments can be conducted ill the ponds " for comparison with raceway data. The quarantine facility will be used to isolate wild brood fish as they are captured and delivered to the hatchery. Disease inspection will be made in this raceway. The brood stock overwintering pond will be used to produce forage for the brood fish, hold the brood fish during non-spawning months, and research brood stock maintenance techniques. In July of 1979, regional personnel visited the Willow Beach National Fish Hatchery in Arizona to tour their squawfish facility and discuss propagation techniques. The letting of bids and contracting of construction work were not accomplished by June 30, 1979. Additional review of the hatchery design was requested by regional and research personnel. Also the Colorado Legislature requested a reconsideration of the plan to propagate squawfish at the Rifle Falls unit. When, and if, these concerns are resolved, construction will begin.