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'I'ra tell., M.. T-_ CUtaI~ ~v%son of i~i.~dlife, Moab, iit~h) Evalua-ton ~o.f . saw-ding=- e€fc.ency: i~ t-h~ snte~g~cst Standardized. _Manstor.ing -Program (l.S~j fnr . YCY .Como squa~#~h KEYTnZE?L~s: CblQrad-c sguawfish,. Pt~rchoch-eilus~-~~trci~us, sampl~g efficienncy., capture-zeza~l. ~TR~CT The:.- Interagency. Staadarda~ ~nito~ring Prcxgram (LS~P)'' . ~~ gart ~f the- Kecovery. Frogra~. (RIPj for. the. egdangered:-fish of the Co.iorado ' ver:. A ..sampling. ~ protoca:f. was. estate-~shec~- fQr tl~e: ISL~F ~ 9 ~ Simlar::.sainpling ~ ~et~h are appii~ to ~ ~~ studies ~ c~it~a tote AIP.~: Knalyses of:. g£2Y~ coloradb:.~fi.sh.: ~Ptycho.chei~.:us I:ticius) distribution, abundance: - re- ivy.. ratc~.~ .rates are: camglcated. ~y _ _._..~.._._....~.._.. --.-.------.m-~ ~`h~g~_c~egree-- c~ sa~l~ng aa~ato~.`~~~h- and :between backwaters. Sa~tpT._~;; efficiency may, be. affect:~g €~t~r ability to a~yze tote data -for_ habitat : preferences. Pr:. cagtr~re-~e~cx~al study- wss ~orxdu.cted using se..nes~ in backwater i~r~ the- been- and= Colorado: Rives in 194 and 19-45- ir~_ €our sampling: trigs . Relative a.~undance. of. s~gecies in the . f"I:.rst pass .was .not. ~,cantLy. different from. that of. the total, e~cept~ for. cha~I:.. _ catf~sI~ _ whi~h~ were ca~i:stent~y underestimated: SignficantlX~~ mores sgeees- were present- iir total than` ins: the first pass. There: were nee si~.gnificant .diff~enees in cap..ture= probability- between.. b~€ckwate-r:=.types, However;. tie=.was-- a great deal of- variati~_ ~ cagtIIre-- ~~ba~slites between.. within a.il types- of~: backwat.er~s. Tie ~ va-ria-tiorr in samgl.i.ng i.s.~ true variation=. ancf:~not an.antsfact of::sau~Ii;~. efficiency.- ~. general, the IS1~P~ sampling protocol is repr-esentat~ue of the f~s~i unify w3thn:hackwaters.