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<br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />II <br />I <br />I <br /> <br />I <br /> <br />I <br />I <br />I <br /> <br />I <br />I <br /> <br />I <br />I <br /> <br />I <br />I <br /> <br />II <br />I <br /> <br />002399 <br /> <br />Rainbow trout were rare, with only 12 sampled in July 1995, when highest <br />discharges were occurring. Their estimated rate of entrainment was <br />.00067 fish/acre/foot (5.0e-07 fish/m'l. Lake trout were also rare and <br />only appeared in night samples. Based on the 11 fish captured during <br />the 3-year study, their entrainment rate was .00108 fish per acre-ft <br />(9.0e-07 fish/m)l. Only six brown trout were collected, five between May <br />and July 1995. Averaged total length was 301 mm and their entrainment <br />rate was estimated at .00030 fish/acre/ft (2. Oe-07 fish/m'). The only <br />other fish collected were four young suckers collected in 1995 which <br />averaged 69 mm total length. Their entrainment rate was estimated at <br />.00025 fish/acre/ft. (1.0e-07 fish/m'l. <br /> <br />Diel differences in kokanee entrainment were apparent during the high <br />discharge period and become less distinct in early spring and fall when <br />discharge was lower. Table 2 presents average day/night fish passage <br />rates per month. A 90 percent confidence interval was calculated for <br />months having more than three samples. <br /> <br />Figure 8 shows a comparison of diel entrainment rates for days when both <br />types of samples were collected. This figure illustrates that the <br />majority of losses during periods of low releases occurred at night <br />while the majority of higher release losses occurred during the day. <br /> <br />~ <br />"0 D.' <br />.2 <br />.;, <br />~ <br />u <br />" <br />Q; 0.15 - <br />'" <br />.<: <br />g <br />II) D.I <br />ti <br />~ <br />C <br />II) <br />e 0.05 <br />c: <br />ti <br />~ <br />C <br />'" <br /> D <br /> <br />Blue Mesa Powerplant 1995 <br />Day and night koltanee entrainment <br /> <br /> ~ Night rate <br /> ~ D Day rate <br /> W <br /> ~ <br /> ~ YfJ <br /> % _. <br /> ". % !@ <br /> .< % ill( <br />" ". -- <br />iJ1 <br />" <br /> - % <br /> <br /> <br /> <br /> <br />I-.'U..p,'_.".....:-'"\..M.:'.......,.......~-......... ._,.1~..."1..........._.7....\........'_.\.w..-....._-- <br /> <br />Days with paired day and night samples <br /> <br />Figure 8. eomparison of day and night, fish entrainment rates measured <br />at Blue Mesa Dam in 1995. <br /> <br />15 <br />