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<br />MODELING CUI-UI RECOVERY
<br />
<br />Cui-ui egg and larvae temperature tolerance eval-
<br />uations under controlled fluctuating temperature re-
<br />gimes. U.S. Fish and Wildlife Service, Reno, Ne-
<br />vada.
<br />Dahlberg, M. D. 1979. A review of survival rates of
<br />fish eggs and larvae in relation to impact assess-
<br />ments. U.S. National Marine Fisheries Service Ma-
<br />rine Fisheries Review 41(3): 1-12.
<br />Koch, D. L. 1972. Life history information on the cui-
<br />ui lakesucker (Chasmistes cujus Cope 1883) endem-
<br />icto Pyramid Lake, Washoe Country, Nevada. Doc-
<br />toral dissertation. University of Nevada, Reno.
<br />Lane, W. L., and D. K. Frevert. 1985. Applied sto-
<br />chastic techniques, user manual, 4th revision. Bu-
<br />reau of Reclamation, Denver.
<br />Scoppettone, G. G. 1988. Growth and longevity ofthe
<br />cui-ui and longevity of other Catastomids and Cyp-
<br />rinids in western North America. Transactions of
<br />the American Fisheries Society 117:301-307.
<br />Scoppettone, G. G., M. E. Coleman, H. L. Burge, and
<br />G. A. Wedemeyer. 1981. Cui-ui life history: river
<br />phase. Annual Report to U.S. Fish and Wildlife
<br />Service, National Fisheries Research Center, Seat-
<br />tle.
<br />Scoppettone, G. G., M. E. Coleman, and G. A. Wede-
<br />meyer. 1986. Life history and status of the endan-
<br />gered cui-ui of Pyramid Lake, Nevada. U.S. Fish
<br />and Wildlife Service, Fisheries and Wildlife Re-
<br />search Bulletin I, Washington, D.C.
<br />Scoppettone, G. G., G. A. Wedemeyer, M. Coleman,
<br />and H. Burge. 1982. Cui-ui life history study. An-
<br />nual Report to U.S. Fish and Wildlife Service, Na-
<br />tional Fisheries Research Center, Seattle.
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<br />473
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<br />Scoppettone, G. G., G. A. Wedemeyer, M. E. Coleman,
<br />and H. L. Burge. 1983. Reproduction by the en-
<br />dangered cui-ui in the lower Truckee River. Trans-
<br />actions of the American Fisheries Society 112:788-
<br />793.
<br />Sigler, W. E, S. C. Vigg, and M. Bres. 1985. Life history
<br />of the cui-ui, Chasmistes cujus Cope, in Pyramid
<br />Lake, Nevada: a review. Great Basin Naturalist 45:
<br />571-603.
<br />Snyder, J. O. 1917. The fishes of the Lahontan system
<br />of Nevada and northeastern California. U.S. Bureau
<br />of Fisheries Bulletin 35:31-86.
<br />Strekal, T., and six coauthors. 1992. Cui-ui (Chas-
<br />mistes cujus), second revision recovery plan. Pre-
<br />pared for U.S. Fish and Wildlife Service, Portland,
<br />Oregon.
<br />Thomas, J. W., E. D. Forsman, J. B. Lint, E. C. Meslow,
<br />B. R. Noon, and J. Verner. 1990. A conservation
<br />strategy for the northern spotted owl. U.S. Forest
<br />Service, U.S. Bureau of Land Management, U.S.
<br />Fish and Wildlife Service, and National Park Ser-
<br />vice, Interagency Scientific Committee to Address
<br />the Conservation of the Northern Spotted Owl,
<br />Portland, Oregon. (U.S. Government Printing Of-
<br />fice, 791-171/20026, Washington, D.C.).
<br />Thompson, G. G. 1991. Determining minimal viable
<br />populations under the Endangered Species Act.
<br />NOAA (National Oceanic and Atmospheric Ad-
<br />ministration) Technical Memorandum NMFS (Na-
<br />tional Marine Fisheries Service) F/NWC-198,
<br />Northwest Fisheries Science Center, Seattle.
<br />
<br />Appendix: Model and Parameter Adjustments
<br />
<br />Several changes in the model and in demograph- tually no age- 7 fish are recruited into the (count-
<br />ic parameter estimates have been made since Bu- able) adult population, and virtually all fish are
<br />chanan and Strekal's 1988 report was written. mature by age 9. Numbers of female larvae pro-
<br />duced in 1981 and 1982, based on fecundity es-
<br />timates and the size of the spawning run, were
<br />14,000 and 12,550,500, respectively (for these and
<br />following larval numbers, see Buchanan and Strekal
<br />1988). Hatchery input added 104,000 age-O fe-
<br />male fish in 1981 and 450,000 in 1982. Because
<br />survival from age I to age 2 is approximately 0.75,
<br />survival from age 2 to age 7 is about 0.444, and
<br />subsequent yearly survival is 0.85, the contribu-
<br />tion of 1981 and 1982 larvae (both sexes) to the
<br />1990 adult population should be approximately
<br />
<br />(28,000 + 208,000)(0.001)(0.75)(0.444)(0.85)2
<br />
<br />+ (25,101,000 + 900,000)(0.001)(0.75)
<br />
<br />x (0.444)(0.85)
<br />
<br />= 7,416.
<br />
<br />Survival Values
<br />
<br />Cui-ui survival from age 2 to age 7 years was
<br />reestimated to be 0.444; annual survival after age
<br />7 was estimated at 0.85. Survival from age I to
<br />age 2 estimate remained unchanged at 0.75. Data
<br />are unavailable for survival from the larval stage
<br />to age I, but 0.001 is at the upper limit of values
<br />characteristic of fish with broadcast larvae and
<br />fecundity on the order of that displayed by cui-ui
<br />(Dahlberg 1979).
<br />The accuracy of the estimate for larvae survival
<br />can be crudely evaluated if we note that adults in
<br />1990 (estimated at 300,000; G. C. Scoppettone,
<br />U.S. Fish and Wildlife Service Reno Field Station,
<br />personal communication), must either have arisen
<br />from larvae produced in 1981 and 1982 or re-
<br />mained from adults already present in 1989. Vir-
<br />
<br />The contribution to the 1990 adult population via
<br />
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