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Last modified
7/14/2009 5:02:31 PM
Creation date
5/22/2009 5:00:09 PM
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UCREFRP
UCREFRP Catalog Number
7771
Author
Muth, R. T. and D. E. Snyder.
Title
Diets of Young Colorado Squawfish and Other Small Fish in Backwaters of the Green River, Colorado and Utah.
USFW Year
1994.
USFW - Doc Type
\
Copyright Material
NO
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<br />Ictalurus punctatus (22.5-70.0 mm TL, mean 42.9), and 18 green sunfish Lepomis <br />cvanellus (20.7-56.8 mm TL, mean 39.6). <br /> <br />Characterization of Diets <br /> <br />No major or consistent seasonal differences in diet measures were observed within <br /> <br />species for fish in similar size intervals. Accordingly, data for summer and fall were <br /> <br /> <br />combined for species and length intervals by river reach. Trends in values of proportional <br /> <br /> <br />importance of each food category were similar between the two diet measures for all fishes, <br /> <br />therefore only values for mean of volume percentages are reported herein. <br /> <br />Insects, zooplankton, algae, plant seeds, and organic and inorganic debris were the <br /> <br /> <br />main dietary components over all fish analyzed, but their relative importance in diets varied <br /> <br /> <br />among fishes or subsets within a species (Table 1). Based on total number of food <br /> <br /> <br />categories included in the diet of each fish species, diets of Colorado squawfish and red <br /> <br />shiner were the most diverse (18 and 17 food categories, respectively) followed by speckled <br /> <br />dace (15), fathead minnow, channel catfish, and green sunfish (12 each), sand shiner (11), <br /> <br /> <br />flannelmouth sucker (9), and bluehead sucker (6). Diversity of food consumed was greater <br /> <br />in the lower than upper reach for red shiner, Colorado squawfish, flannelmouth sucker, <br /> <br /> <br />channel catfish, and green sunfish, whereas diets of sand shiner, fathead minnow, and <br /> <br /> <br />speckled dace were more diverse in the upper reach (the diet of bluehead sucker was <br /> <br />analyzed only for fish from the upper reach). Diet diversity relative to fish length was <br /> <br /> <br />greatest in red shiner, sand shiner, fathead minnow, Colorado squawfish, speckled dace, <br /> <br />and bluehead sucker 21-30 or 31-40 mm TL and in flannelmouth sucker, channel catfish, <br /> <br /> <br />and green sunfish > 40 mm TL. Mean % fullness of digestive tracts was highest in fish <br /> <br />21-30 or 31-40 mm TL for all species. <br /> <br />7 <br />
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