7739

• UCREFRP Catalog Number: 7739
• Author: Muth, R. T. and T. P. Nesler.
• Title: Associations Among Flow and Temperature Regimes and Spawning Periods and Abundance of Young of Selected Fishes, Lower Yampa River, Colorado, 1980-1984 - Final Report.
• USFW Year: 1993.
• USFW - Doc Type: \
• Copyright Material: NO

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Table 7.-Relative abundance of age-O fish, by river reach and over aU reaches per year and by
I reach over aU years, for selected native fishes collected with seines from backwaters or shoreline habitats
with negligible water velocity, lower Yampa River, Colorado. Relative abundance indices: CPUE =
catch-per-unit-effort (number of fish per 1,000 m2 sampled), and PO = percentage of occurrence
I (percentage of all samples, per year and reach, in which fish in either age class for each taxon occurred).
Only samples collected on or after estimated initiation of spawning for each taxon per year were included
in analyses.
I River reach'
5 4 3 2 1 TOlal
Year Taxon CPUE PO CPUE PO CPUE PO CPUE PO CPUE PO CPUE PO
1980 Gil4 sp. b 328 86 815 73 346 46 1,556 57 1,080 68 807 64
I Rhinkluhys oscu1us 238 86 439 100 218 69 1,280 79 414 58 437 72
CalO.flOmUS dUcobolu.s 38 29 109 27 134 54 251 43 3S 35 102 39
C. loIipinnis 75 57 74 45 44 62 52 50 19 39 40 45
I 1981 Gila sp. b 401 67 981 82 834 77 806 69 1,224 74 1,043 73
R. C1ISCU1w 1,254 73 239 73 572 77 250 48 317 67 334 63
C. discobolus 28 20 50 45 297 62 59 18 97 25 93 26
I C. laripinnis 7 7 19 45 45 31 11 10 44 20 41 18
1982 Gila sp. b 0 0 0 0 3,366 50 677 63 946 73 966 64
R. osculus 0 0 140 100 308 80 266 64 224 53 233 57
C. discobolus 0 0 0 0 177 50 201 39 149 36 158 34
I C. laripinnis 0 0 0 0 34 50 105 39 162 48 141 42
1983 Gila sp. b 67 50 1,085 88 729 59 719 56 1,026 75 955 71
R. osculus 0 0 285 88 426 76 635 48 667 67 602 65
I c. discobolu.s 67 67 20 24 307 59 110 23 266 34 240 35
C. loIipinnis 83 50 26 35 60 35 35 23 144 36 116 34
1984 Gila sp. b 306 50 556 SO 1,354 79 731 73 740 71
I R. osculus 418 71 333 56 2,219 100 784 85 814 83
C. discobolus 173 79 552 50 3,333 79 815 87 874 83
C. latipinnis 112 43 33 44 83 100 150 63 146 63
I 1980 Gil4 sp. b 199 51 637 63 1,166 56 1,022 64 1,001 73
R. osculus 371 46 304 85 373 70 930 59 481 67
1984 C. discobolus 33 24 70 37 293 55 791 32 272 44
I C. 1alipinnis 41 22 43 35 46 44 57 31 104 40
'Reach 5 = Cross Mountain Canyon (river km 94.1->89.1), Reach 4 = lower end of Cross Mountain
Canyon to Lily Park (river km 89.1->81.8), Reach 3 = Lily Park to Deerlodge Park (river km 81.8->72.2),
I Reach Z = Deerlodge Park to Harding Hole (river km 72.2->32.2), Reach 1 = Harding
Hole to Yampa-Green River confluence (river km 32.2-0.0). bPrimarily G. robusta robusta.
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