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<br />SENT BY: <br /> <br />,. <br />, <br /> <br />1-12-96 3:15ffi; UTAH WILDLIfE RES.- <br /> <br />303-236-0027;# 7/12 <br /> <br />r~to6 for n~tive fioh in main channel backwatero in th~ vicinity of <br />deaignated 8i~Q8. <br /> <br />Larval tleh will be ooll~ctQd with liqht traps oolncidgnt with the h\gh <br />flow pgriod. BiweeklY eampllnq of each Bitq will be mBintainBd <br />following p~ flows 8nO oontlnuQ until terraCG habitat6 have boQr~ <br />dewata~6d. Pbllowlng dewatering of terrace bahit~ts eamplin9 w~ll <br />continue 00 ~ conthly b~lg in depression hab~tAte containing water anC <br />the """in c::hlU\nel in habitats adjacent to <!.e"i9I1at~ ..ites. Pish. <br />collections wl11 ba made with an QIQctro~hQQkor, tr~l neta, fyke <br />net., and BQLnea. ~ot.l lOdgcha wIll be ~ordcd from all fish. <br /> <br />Nqnnative fish ~AluRt.ioQ <br /> <br />Re'"ponl58 v.!\J:iablee to be meaQured for nonna.tive t!ellOs arlit aQ follows: <br />.rel~t!ve oabundancQ, cohort; an.a.lysiB betwee.n YQars, reproduction.. <br />rel~ti~ abundance and composition of fieh food orqaniBmB, food habits, <br />and growth rateB. <br /> <br />~h8 study design iB 8~ructur~ to measure the response at the entire <br />nonnative fioh community throuOh target specioo. ~hB tar~t s~cies <br />includo cQnt~arcbids, cyprinidB, channel catfl.h, and northern pike <br />(Table 1). Tbee.. target Bp<>cle8 were selectOO because thay are known to <br />bavQ detrimental effectB on tne ondangQrg~ fisbsB and/or they are in <br />high ooncene~4tlonB througb out rgachag in tbe Upper Color_do River <br />Ba.s1.n.. 'rha Gb~dy dBB!f}n irJ pre~entgd in Table 1.. GQ'OtJira.lly, the <br />sampling daBign was 8tratified inte tha various species, life &tagee, <br />and available habitat.. I~ is sequeacad both spatially and temporally. <br />We enviaion tha~ difforone ~ochnique. and effort. will be required to <br />monitor and 6v~luate the nattve and ~onnativa species response. The <br />B&mpling, design, therefore, has bGGO stratified to focueea effort6 <br />between th8 different OONwlity COmpanal'lts. Specitica.lly, w.a Qtlvi8i.or. <br />that different intensities (waakly sampling tor nonnative spQCies VQraus <br />biweekly samplLnQ for native spoaie.) and difterent gvar types (light <br />trape for nati~ apAcieB versus dip net6, ~~ll mesh 8ainss, ete) will <br />Ix> U8ed. <br /> <br />., <br />I <br /> <br />P'irlh. fQOd nrn,.n'lRm ,."Ii w.'It.er m;~lir.y Avlitlmlt-"on <br /> <br />Re8ponse variable~ to be measured for fish food organisms and water <br />qualicy Qyaluatioq are ae folloWdl quantity or orqani8m8, BpeciQQ and <br />gi~Q aompoHi~lonr ~nd water quality variables rdL~oolv~d oxygen, etc.) <br /> <br />BiwQekly saBplinq will be implemonted to Q~t.bli.h the quantity <br />(~ensities and biomass) and diversity of mac~oinvBrtebrates occurring in <br />natur&l and application floodplain wStland~ and adjacent river rOAches. <br />Kacroinvertebrat& produotion Will be measured using Burber BAmplee, kick <br />8~pleB, and benthio OO~cs. Dur1nq periods of water flow bBtween <br />inundAtsd area. and the ri~.r. drift nete wIll bs used to estimate <br />tra~.fer. of partieul~tQ org9nic matter an~ macrotnvertebraC684 In <br />addition, water quality parameter~ thAt affQet these organi8me wL~l b~ <br />measured from weekly watQX oamplBs using an autoanalyzer, and other <br />water quslity parameters will be measured usinq Hydrolabs. W~tQr <br />.amplB. wlll be oolleoted at outflow ar8a. of floodplains and ~nalYEed <br />for nutrient conc9ntrations to detgralne infl~x concentrations. <br /> <br />.. <br />j" <br />I <br />