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253. Implement at lenat LivM habi*at tilana by delegating ' responaibilitiaa to land and aster management aSencins. Habitat management schemes will require multi-agency cdopera- tion and funding. Specific responsibilities will be allo- cated in proportion to their role is m,aaagiag land or water in each geographic area selected for humpback chub restoration. - 3. Establish a lox -term h back chub and a short-term b tail and roundtail chub ca tive ro a ation ro ram to su 1 fish for scientific studies and reintroductioas, and to o ulate refu ia. humpback chub populations Under present environmental conditions, seem likely to continue to decline even if certain management options are successful. The paucity of -successful reproduction seems to be as important weak link in the chain of events endangering humpback chubs. If certain wild populations became extirpated, they could be re-established with captive-reared humpback chubs if reasons for extirpation in that area were eliminated. Hatchery culture will also supply specimens of knows ancestry to clarify taxonomic variability and relationships among and within the Gila robusta complex; Further examination and description of related species and their knows hybrids will enable investigators to accurately identify all life stages of attic species. The hatchery program will be humpback chub sad symp limited to species of the-Gila robusta complex sad Gila River b10 000 ~- 31. Build facilities at a new or existin hatche to roduce _ _ .,. ,..,.. ___._a.~~ i ~t,ai~s_ 10.000 bon ail chubs and certain hybrid crosses anaua119• Aa existing hatchery within the Colorado River drainage should be ~p~ded to include new propagation facilities for fishes of the genus Gila, Likely candidates are the Rifle Falls State Fish is Colorado. Hatchery or the Hotchkiss National Fish Hatchery Facilities ~should~iaclude small ponds for holding brood stock sad rearing fingerlings, a hat~~g house to incubate eggs sad rear fry, design to induce spawning of brood- and several raceways of varying stock and serve as rearing locations. Unless natural warm water is available (5S =70') it will be necessary to use recirculation systems, biological filters, and water heaters to achieve proper spawning and growth temperatures. 20