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Sampl%ng efficiesrc~r is~ lowest rr areas with ~ a~rstructed substrates (weeds or•. roc~~:~°~: but d~s~.. note seem to be ~eeted by degtli of water, depth of: mid, ~. total. backwater. .~-z~: The variation. observed in,: catch; rates' azrd=: capture ~ probabilities cannot be~ attributed to the=se:: €b:~ . Catch` rates in the:.. secCic~.n. of. the-:same backwater. taken at different. times and :days: d.~.great:. The: second saa~ge.~CPU was variously. higher, ~€3weF; ~. the:.. saw.. There was~~ no_ txbserved reYations~.ip• ~-of catch-rates`: ter- capt~t$~-probability to tip- of day or temperature. Also.r~ ~~ted~ .sag-:.. did not• sigafica~tly reduce the catch rates. or. t~e:~n~nber o€ fish:present on_ suksseq:~~t occas=ice . TYte propensity _. o.€ tireae::s ` pies: to: ° assemble in. integrated school's affects the`i~r~ c~strihuti~~ Within backwaters. Fish dstribution•.~ is not . h~:genQUS. or. raadam:.. lnstead,..~they occur in di:~s~unct groupings . ~. A.~ se-iae: haul... .ed in: any one ~ spot has an ini~ti~al ~catch~, rate l~as~:.more~-an-. whetth~r_'-ar irvt fish are schooling ~at that. Zncation._ tharz.•. aaythi~g. e-f.~e.~ ~ repeated saatgling:. within backwaters- is necessary, ta. o3~tain.~ a~ representative sample . ~ ISMP al.ready._ accounts for:: this: by" reguiririg . trero~ seine :hat~is:.in each backwater . Re~.a t i a~ig with"~,~P These: data can be; ~used:_ ~~. f~t#e=~ our:. i~nowledge o~• Colorado squawfi~sh~ populations in t~e::rivers-~. The CAPSORE programs .generated