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tL.?+ ?} 4S .+rn!'`;hl if nrit +1In l„ n6. TR( F...+ tl?i+ ntLrrv. 4-4--c wl-ir-h rr,a.• wnci-r4nt <br />: r ? :y:. <br />use of these return draws by the endangered fish species. <br />Both Colorado squawfish and Razorback sucker have successfully reproduced <br />at Willow Beach National Fish Hatchery where the TuS is around 820 P..P.M., <br />(Quote). With-little exception, waters included in the riverine study area <br />are less than this value during the late spring-early summer spawning periods <br />of these two Colorado endemics. <br />The year 1975, as shown in the Table 5, was selected as an average year <br />for both water flows and fishery conditions. Both squawfish and razorback <br />suckers were found throughout areas with the above conditions. N.F.R.I. <br />iiUcS iiiiV vex IeVe i.uut Io?'r3 vr i iua.t,Uatiiig EYur.a.f' IN, eiisi.i . J 'Jr61 In. <br />ranges, as present above, are limiting factor for the endemic Colorado River <br />species. The Gunnison River had a peak flow of about 1850 C.F.S. (USG91,1976) <br />during the study period of 1976. This is below the flow N.F.R.I. feels <br />would be optimum for reproduction in the backwater sections of the study area. <br />The maximum flow in 1975 should have adequately filled backwater areas along <br />the Gunnison River, but without more definitive data on spawning requirements <br />of these fish, 1975 should not be considered the ideal flow. Maximum flow <br />in 1976 of the Colorado River nearly equaled the maximum flows in 1975 (USGSI, <br />1976) but this peak occurred well before known spawning periods. The peak <br />flows were observed about the first week in June, approximately one month <br />before prime spawning time. <br />Macroinvertebrates <br />Several collections of macroinvertebrates were taken from the Gunnison <br />River and the Colorado River. The major families of invertebrates collected <br />(22)