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Ta= test sampling effcie~ne~r, the following hygathe~es were deue-loped; 1. Ho. There is. nog sggnzi~i:cant..d-~:fir-Wince..ig:_speces.:co~cs~:t~an and relative abundance between that obserued in the .first seine haul .and the composition of the- entife ~ ba.ckwater, or Mocked pcrti:.on-.:the:zea~ 2. Ho For each species, t.fie:re~: is no- sg~rificant dkff~rence in capture _pt~ability between. morning.F afternoon; eve.~ing. anc€ night. 3. Ho There-is no sign€icant df€er.enee in capture- probability at- different- locations ~ritfrir~ a..back~ater. ~mcuth, :mid~;e=r er~,d) 4- Ho ~~ere. is no. signzfiEant. di~€ference in initial. capture groY~abiLity be:tweerr~: backwaters -with- ~raxi:a~rle seining.. d:iff~:~e~1ty . -~c~is Sampling effic#encg testing was conducted in 19~g4~-og tie iowQr Green RiQer~ centered around the l~turser~ Flab-itat section- (-~ 57=47) ftF©T~R 1992,.1~393,199~~ .. YC1y~ sg~awfsh ~e relatively abundant in this., area, compared to the Colorado River.. Sampling accursed-after each Nurser~r Habitat s~-ling. trip: (sgri~j_ summer, fallt-. Asp many Yackwaters were sam~zled:~ as possihYe i~ ~ days . Large: backwaters took u~ tQ- 6 ..hours to c~glete the sa~l:ing process, sc sample s--izes ~ wee ~fortunate:~~ s~1.1. Thee fist si~t~: a ~ smarm _-bay.. ~ 58m... g.. ~ ..~ti~_ a substrate of mud and...~y..yo~g tamrari~k g~:arcts. It' was ~rlocked:.~t tha- mouth ~anrl::into ..t:~ro seet:ons::. As seining:.proce.eded- it' became clear ghat. the sections were~~ toa~~ large; the' fish had: too- iaar~y opgortuniti.es. to escape-.. the blocking. -atethod~ was .altered~~so tit the width of=: the section. was:. equal t:a. the: width- of. the'. seinse, allowing::near~y..complete depletion_ of fish from a small:. section: of the: backwater.... This method was: foliowe~ thereafter. A m~x~Fr-trm _ of three- sections: were• block,ad:::out in: each:~.~.backwa.t~r txs.ng~. large f~12.2m x Z_8m: x ~...~~n) _.seines. Sections :were• 4~5 m-:wile