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~'~ne i- ~.,shuae Hondr;~s .. ~, Ravmcno ~_ ~~rei~ ~; Wr~'r4r ~,. ._. Reservoir C.or.y ~~-_ - LF: 5ca~ea n Lateral Line Figure 3. The number ci sc ales ~~ ~ "_r pater i ~;r~-; for various populations of cutthroat trout tram i.ftah and adjoining states (The dark. 7e ~ at~s the pe;~ulation mean, the shaded area of each bar indicates the range for each fish papulafion,„•. '. ~.ka <r~,ni a~,r;nke 1976a, 1976b; and Hickman 19771 the predominate good ~~~ 1~zrirs~ this early summer period (Table 4'. A.il stomachs contained =or,~ n ~ ier~~~ and, in most cases, numerous food items were found in each sta. ~~ 'hl vc,lurne of food items eaten by both young and old Bonneville cutthrc~' > _,y compered with the benthic communities in C3irch Creek, I3eaver Co~~ ~ i~ (hii;~.are 4). Seasonal changes in coaumption of certain food iten~.~ ,~.:~-: ~ ~~ ex~ecteci because of seasonal changes in Lbe abun- dance of macroin~ ~x; ~~:~~~ ~ ti rr> ~•~w of macrobenthic communities ocrurtng in Birch Creek indi _, r. m- ~~vertebrates were more evenly cistr:buted in the stream Burin<- - ~ ~ ~ ~~ ~ tad that some benthicforms became highly localized during iai.1~ s~~ ~ ~ ~~ early fall (Winget and Reichert 197?. This clustering of certair, i ~ ~ eF~ra.es ~iay be associated with lower stream flows thus reducing suitat '~ e' ~ ; ~t ~< in?_ rtvertebrates and considerably altee-ing the natural drift. ?~ ~~..~~_~ ~ ~m a highly diversified diet during early stammer months to a more rer! ~~i ~ !' .~t rite.-, ng late summer and early fail ;No;ald res~;ii from fluctuation in r~ .~ ~ ~ and s^F~~~ies of invertebrates. Information opt winter food habits way, n:~t t~ .~~ ~_~~~i; ~i± is likely that feeding wouldHbp drasiicaily reduced because ,:' 'a~~ amr~F~=~tures, and confinement of aga~~atir. in- vertebrates fauna in • 1, ~ ~ :: r~ <;_:~~.i z to individual fish. Examination or c;: ~~', ~ ~ ens sampled i n the fall of 19'7 ~ from `3 rout Creek, Juab l:ount ,- ~ -. ~ ,. ~ ned primarily terrestrial invertebrates (Charles Thorn.pson, ; - ~ ~~ ~ ~ nication).~ Hickman (1977) also examined Bonneville cutthr~.:z~ ~ ~ ~~ ~~~ ~ tt Creek for food preferences. lie r`r,tzrd i.h.at terrestrial inset! > ~ ~i ~! - ~-~mprised 50 percent by volume of` rt1.e diet but aquatic fog°r ~ ~ ~ ~ ~ i ~ ~ ~ ra, Fphemeroptera, Diptera, s'ieco~tera, Coleoptera, H~ n,; ~:' ; ~~ _ ~ nd Iaepidoptera were also eaten. These recen` ~ ~ ~ ~ - ~ ti ate the opportunistic feedi ~tg~ n=ttr x~e of Bonneville cutt~h ~ ~ C~n1_~r.ranately lake populations of S. ~~. u~a.,'a ~~ere not available for coml.€3V ,.-;3r ~~v~tn earliew reports. It can be s~ecuate~l thai 3Mr. Charles 1'hompeon, R~ ~ F~stae~rie; Manage.-, Utah State Division of s~ualire r'.esr;t~; tea, Central Region, i'rovo, U' '~, •~ 1 10 "39 15Q 161 172 183