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140
<br />30
<br />25
<br />20
<br />15
<br />10
<br />5
<br />U
<br />w ~
<br />C
<br />Q
<br />w 30
<br />o_
<br />~ 25
<br />20
<br />15
<br />10
<br />5
<br />0
<br />KAEDING ET AL.
<br />I
<br />1983
<br />DISCHARGE ~
<br />~~ .d
<br />,~ ~ „~
<br />• ~~.~~
<br />~'„'~~~~
<br />_ ~ ~ ~.~~
<br />~, , ~,~ e
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<br />-- ~
<br />f
<br />~ TEMPERATURE
<br />,,
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<br />`~
<br />,,
<br />,,
<br />~ ~ ~' ,
<br />~~
<br />;,
<br />1~ ~
<br />1 ~~.
<br />i
<br />1984 fl
<br />DISCHARGE
<br />~ ~
<br />,,,., ~
<br />~~ ,
<br />„,
<br />,~
<br />,~
<br />~~
<br />~~
<br />~~~•
<br />.,
<br />~ ~~,ti 'u ~
<br />,~~,~
<br />,,
<br />~~ ~
<br />. _ „-~
<br />•~ ~ TEMPERATURE
<br />,,, ,~~ , \
<br />~ ~,~ ~~,
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<br />~,
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<br />r'
<br />,~
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<br />.,
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<br />20
<br />15
<br />10
<br />5
<br />N
<br />E
<br />0 0
<br />0
<br />w
<br />20 Q
<br />U
<br />0
<br />15
<br />10
<br />5
<br />0
<br />J F M A M J J A S O N D
<br />MONTH
<br />FIGURE 4.-Discharges and mean daily temperatures of the Colorado River at Black Rocks, Colorado, 1983 and
<br />1984. Estimated spawning time for humpback chub and roundtail chub occurred between the paired vertical lines.
<br />the estimated spawning times in 1983 and 1984, time in 1985; however, during 20 June-30 July
<br />our contacts with radio-tagged humpback chub 1985, our radiotelemetry data showed contacts
<br />were predominantly within Black Rocks, whereas with 90% of 87 humpback chub and 11% of 27
<br />most contacts with roundtail chub were outside roundtail chub within Black Rocks.
<br />Black Rocks. During the period between 20 June We recaptured 63 Carlin-tagged humpback
<br />and 30 July in 1983 and 1984, 88% of 72 radio chub; most (55) were tagged during our study, and
<br />contacts with humpback chub were made within the rest were tagged during earlier investigations.
<br />Black Rocks, whereas during that period in 1984, Two recaptured fish had been tagged in 1979, three
<br />only 22% of 9 radio contacts with roundtail chub in 1980, and three in 1981. Two of the eight
<br />were made there. We did not estimate spawning humpback chub implanted with radio transmit-
<br />
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