7785

• UCREFRP Catalog Number: 7785
• Author: Thompson, J. M.
• Title: The Role of Size, Condition, and Lipid Content in the Overwinter Survival of Age-0 Colorado Squawfish.
• USFW Year: 1989.
• USFW - Doc Type: Colorado State University,
• Copyright Material: NO

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13

level of lipids necessary for survival was determined by
calculating lipid content of all starved small and medium
fish that died during the experimental period.
Wild age-O Colorado squawfish were collected from the
Colorado and Green Rivers in October 1987, April 1988,
October 1988, and March 1989. Fish were captured by using
0.32 cm-ace-mesh beach seines, 4.6 m long by 1.2 m deep, in
backwater habitats. All captured age-O Colorado squawfish
were measured for total length, and a randomly selected
subsample was weighed and frozen for future lipid analysis.
Mean total length, mean condition factor, and mean
lipid content were calculated for samples of fish removed on
days 70, 140, and 210 from each size class and feeding
regime. One-way analysis of variance -tests were used to
determine if mean total length, mean condition factor, and
mean lipid content-within each size class changed
significantly during the experimental period. Where
significant differences were found, Tukey's Honestly
Significant Difference (HSD) method of multiple comparison
was used to determine which differences were statistically
significant.