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213 'J'hf~ CJhjf~c:tivns ot thjr.... inve;::;tigatton are to: 1 " Determine SfBl;Jni 119 ] c.lcat" j ons ot en[~angC!rcrl f j sh j n l,'-"ltaract Ca nyon, 2. Determ.lt1C: if hUl\pr,ack chub popnlrit"iolJS exi.st .1n l...'lt"ciY'Cict f',anyor., and 3. '1'0 M1at E:xt';;ii.t t'll.e cJpE!ratiol1 of Lc~~ P("J~} 1 :lnt .Iller-leas nrll....r;~ly hatli "tat" af Colorado SrjJCi1;Jf ish :in the [:1y1.~::;um Ganyon area. Al though the i.m:estigatian was concentrated in the 16-mile reach af (':cltill'i1Ct Canyon trail "thr~ contluence ot the Green and Calaraio Rivers tn Imperial Cci."iyon in upper kikc~ Pm\k~J.1 (Figure 1), 5alIpJ .ing was also conduc"ted in the 50 mih~3 af tile tvc. r.1V(!l'S rtbnvE'! th{.~ confJuf~nce starting at. "the Fo-trlSh and Mine.ral &.'}ttan lc:mnchp:,.;. Gatcn'iict Canyon is a ,,-.Jili tewat:er reach with 25 major rClpidr...., and is ll\Cl11rtged by Canyanla."icl:; Nation;:.:! Park. METHODS Six 5all'i.1f: "trip::.:; were condl.1ctP.d thrnngh Cataract Canyon bet1.veen July 11 and. Octol.er 6, 1936. ~ch trip consisted. of 3 days an the river. Thl'C~ l;,,11i tevJdter rafts ,,"-18re m;;l~d nl1 each SdrGplf! trip. An] s-tcJOt" RUmn P.clV;:.t:.::;U Wi'.F; ll!":f!d as an elf":ct:rofi.sh:ing rc:dt r..r.d a 1"/- foot Rikc~n HavrlriU ~;; U..c;F-c] as a netting boat. F-Acll raft was pcNmred by a 2~)-horSf~p()\AEr Mercury XU outbOard motor. A 23--faot matarizc:rl .I-rig wa:; USE:-d to carry C"'..al1p gear and as a support cl~aft . St3Jil!).tiIlfJ g8Cir in.cJl1L1eil ~~2{;-v(;lt L,(~ f~Jf~ctl:--ofishjng, g.i]] nptsz t"1"'arrJl'18J nets, seine-a, kick screens, and larval drift nets. A]) endanLJpre..i fish ,,"Jere measured. and wl?ighed, cmd thOSt~ over 20(} rmn t:ot";d :length were eqnipp."xl with seriaJJy- numb.""'!rc>d Carljn dangler tags. Young ti~,h that could Th")t be identified were pre--'~rved in 10%olfte:r'i?,1 fm'lnaJ"in ane! tOlwarded to "the IarVrti Fish laboratory in l:c'or"t Goll~l1:3, Colora1cL p\ C:()llCf~l"'tf"~j effoJ:"'t \'Ja.S Jr.ad8 t~o mirli.ri1_izi~ nl()l"taljty t"CJ a]) tis~, il"lclud.i.l1g sll.Ort--t8i:=n1. s;,~ts Cil1. all gill anc] tralnmeJ nets, arri inllued.iat:e retu1~1 of all identifiable fisl~~3. RESllJ,'r:; ~~~~~l~i.. of Fist;. C9_~__~.~~!~q~~ at tish ,,"Jere t'.a::1CJJH1 c:lm:'.ing th1s investigatian ('rable is nearly identical to that presented for the 1935 2~' spl-~f:iF~S (V;-l]{"]t:-:~z F!t al. l~JSb). A tntalot 23 SpCC:l0.S 1) . .rhis list: ot sIJeC1es jnvf'!Stj~;rtt:ion ,,"JhJch repm'ted 'I.'he five most COTIlllOn specjes of fjshflB r.-rtptl.H'f:,(] in CataraCT Cany..")n .1n 1986 W2.,:,\, sand sh"inc:)", red sh"inm', ch;:rnn.eJ c.-:;tfjsh, flathertd mim1a;J, and carp. 'l.'he'-.ooe specie-a m.;:~jp up ~-l1.h% of thf~ tot"al r.atchby nll1nb""'!r.