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-12- ~~. ~~~;`r ~~linckley 1983; [~1~~rsh, ASLI, pers. co,nn]un.) and larvae and fing~.rlings (Ulmer 1931; rirooks AG~"D, pegs comanwl.) has been documented, and may be a significant factor depressing lower basin papalations. Maintenance of pre:~ent papt.zlat_ion l~:vels may be greatly limited by exotic fishes in the lower river. HTSTORY OF LOb~JER COL ORA~O RIVER F3ASIN RECOVERY Et:'1~'ORTS All available distributional and life-history information-far. razorback sucker and data relating to future water plans f_or the Colorado River system indicate the 4pecies will continue to decline toward eventual extinction in the absence of a recovery program. Although razar_bacl;s still occur in major lower basin reservoir-s, these populations are comprised of senescent individuals, with no evidence of recruitment (t~7inckley 1983,. hlcCarthey 1985). ~ small number of adr.~lts apparently stiI.l inhabit the lower main.~trea;~ r_ a_ver® Hac~aever, it is evidont that successful recruitn]e~]t is inadequate t:o mai.nt~)in viable populations. F^derEx]_ 11St1nC~ vi;cltUS Tn 1.978, raaorr~ack suc);,er way ~i~rapo~~c:d for i~ederal ~~ndanger_~~~cl status. Under 197x3-79 ~~-nem~t~tcrlts to the Endar]rer~~d Sr~~;ciE~4~ .pct, t:'ndur"li~C`r'k~t St~'t~.l::r' ~:F)L1~.CI rr?~~I_J<:=it1C~~~.~.~ j°rC"C7?'E~i;~; Ot3~.~ C<;'rltlCr.~1 - ilc`.x;7l.f::;)t.: ~~?i:~+`i1~1:,1.C].l. l:C)1: CaT1tJ.nl:E~t~ E:X1.~i~°~lC]i'c? Q t'r~l.E? `:iI.1~'•C;13:a. .~i3r]~'C~ ~ ` Z J_ t-. i. c:_ t~ l ~"r ~'~ ~~! l t ~~ t ~ c i I. ~' rtz C. L 1~` .~r :' Y' r? 1 I 1 ~ i.} r?r'~ I. C? t c' x,1~ ]_ i~ ";;: T] t J. i 1. F,' ~l <;l 1"] l~ i7')aC.~.'~j 1.1r]C~;?t°:~is~.JC)():d ;]t~ t;l<<t` 1:Lr:i+?~ i.i1'~ ~17~~_)~1r?''i~ t ~,`1`.:i Y/1 `_T Cik:~=]'r'~"t1 ~:?n\~