3125

• UCREFRP Catalog Number: 3125
• Author: Wick, E. J., et al.
• Title: Colorado Squawfish and Humpback Chub Population and Habitat Monitoring.
• USFW Year: 1984.
• Copyright Material: NO

1i
Table 1. Mean annuli measurements in mm from the anterior field of Age II+
to Age XII+ scales removed from Colorado squawfisr captured in the
Yampa River, 1982., using the regression equation Y = 3p46.763 4 +
1.2074X
Mean annuli measurement, mm
Annulus Number
Age 2 3 4 5' 6 7 8 a 10 11 12
VI+ 57.5 86.5 106.5 121 131.5
VII+ 52 75.5 97.5 118.5 134.5 145.5

VIII+ 55.5 85 110.5 127 140 151.5 168

IX+ 52.5 76 99 116 136.5 151.5 168 182

X+
46.5
66.5
89.5
116.5
131.5
145
162
176 188.5

XI+ 54 80 109.5 129 143 155 167 181.5 199 213

XII+ 56 81.5 104 122.5 146 158.5 182.5 206.5 217 228.5 237.5

Table 2. Backcalculated lengths in mm of Colorado squawfish between ages VI+
and XII+ from the Yampa River, 1982.
Backcalculated Lengths, mm
Annulus Number
Age _6 . 7 8 9 10 11 12
VI+ 509.34
VII+ 517.25 529.71
VIII+ 518.96 531.97 550.65
IX+ 515 531.97 550.65 566.49
X+ 509.34 524.62 543.86 559.7 573.85
XI+ 522.35 535.93 549.52 565.93 585.73 601.57
XII+ 525.75 539.89 567.06 594.22 606.1 619.12 629.3