9449

• UCREFRP Catalog Number: 9449
• Author: Hawkins, J. A.
• Title: Recapture and growth rates of three Colorado River endangered fish species
• USFW Year: 2003.
• USFW - Doc Type: a comparison between electrofishing and non-electrofishing.
• Copyright Material: NO

Table 5-Least-squares statistics for regression of growth rate (G, mm/month) as a function of logo total length (TL, mm)
of three Colorado River endangered fishes during first and second growing seasons after initial capture. Regressions are
G = a + b•log,o TL. Razorback sucker data from the first growing season were not appropriate for ANCOVA analysis
because total-length ranges by gear were mostly non-overlapping.
Treatment
non-electrofishing
electrofishing
non-electrofishing
Slope (SE)
Recapture interval Sampling gear df a b r2
at initial capture
Colorado pikeminnow
1 st growing season electrofishing
2"d growing season
humpback chub
1 st growing season
2"d growing season
razorback sucker
2"d growing season
Intercept (SE)
174 86.42 (11.13) -30.45 (4.09) 0.24
121 86.08 (14.20) -30.55 (5.19) 0.22
168 85.77 (5.76) -30.27 (2.13) 0.55
90 69.41 (7.17) -24.44 (2.64) 0.49
electrofishing 11 62.22 (15.60) -24.18 (6.26) 0.60
non-electrofishing 45 15.12 (12.98) -5.86 (5.28) 0.03
electrofishing 5 15.60 (6.67) -6.03 (2.75) 0.55
non-electrofishing 31 21.72 (5.89) -8.42 (2.42) 0.29
electrofishing 34 39.84 (12.23) -14.56 (4.51) 0.24
non-electrofishing 7 47.84 (24.17) -17.50 (8.87) 0.39
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