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32. Annually maintain and operate two facilities as fiuanobsck chub refuaia and to produce a minimum of 20,000 ht,++T~back chubs through 1990). 10,000 roundtail chubs, 10,000 boaytail chubs, and their hybrid crosses (through 1985). When two propagation facilities are achieved (one sew facility and the Willow Beach National Fish Hatchery) it will be possible to produce adequate nutabers of humpback and other chubs. 'Most facilities will incur their major costs during construction or modification; day-to-day operation costa will be relatively constant throughout the expected •1Z year life span. The Fiah and Wildlife Service, Bureau of Reclamation, and certain state wildlife agencies will share the responsibility for funding the operation of propagation facilities. These two facilities will also serve as refugia for the humpback chub populations. 33. Develop propagation and holding techniQues to maximize production of yo ~ and maintain adult brood stocks. Most of the necessary technology will be developed in situ under controlled conditiana. Specific problems are treating diseased brood fish successfully, inducing maturation of the gonads, and simply keeping brood fish alive and healthy over a Period of years. 34. While maintaining genetic integrity. produce_or acquire and maintain the following brood stocks• 10 pairs of humpback chubs in each of the two facilitiea• 10 airs of roumdtaii chubs in each facility. 5 pairs of bonytail chubs at the new facility, and 10 pairs of bonytail chubs at Willow Beach. The necessary. size of the brood stocks in each hatchery will depend upon their fecundity and the culturist's success in fish- i.e., adequate technology and manpower. producing yo~g s The above numbers of fish are estimates. Adults and subadults (replacement brood fish) will comprise the total brood stock. Equal sex ratios may be used. 21