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Last modified
7/14/2009 5:02:31 PM
Creation date
5/22/2009 5:00:09 PM
Metadata
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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 />Insects (mostly aquatic forms) were a principal part of the diet for all fishes except <br /> <br />fathead minnow and bluehead sucker. Of the identifiable aquatic insects, immature <br /> <br /> <br />dipterans (especially larval midges, i.e., ceratopogonids and particularly chironomids) <br /> <br />predominated in digestive tracts. Larval chironomids represented at least 21 genera, but <br /> <br /> <br />most were Chironomus followed by Rheotanvtarsus, Eukiefferiella, Polvpedilum, Tanvtarsus, <br /> <br />Cricotopus, and Micropsectra. Representative families of other immature dipterans were <br /> <br /> <br />Simuliidae, Dolichopodidae, Empididae, Muscidae, and Tipulidae. Proportional contribution <br /> <br /> <br />of immature dipterans to diets of red shiner, sand shiner, speckled dace, and flannelmouth <br /> <br /> <br />sucker was higher in the lower than upper reach. Relative importance of immature <br /> <br />dipterans in diets of red shiner, sand shiner, and speckled dace decreased and utilization of <br /> <br />other insects increased as fish length increased. Conversely, relative importance of <br /> <br />immature dipterans in diets of Colorado squawfish and channel catfish increased or <br /> <br /> <br />remained high as fish length increased. Water boatmen (Corixidae), larvae and adults of <br /> <br /> <br />aquatic beetles (predominant taxa were Dytiscidae, Elmidae, Haliplidae, and Hydrophidae), <br /> <br /> <br />caddisfly larvae (mainly Hydropsychidae and Hydroptilidae), or mayfly nymphs (predominant <br /> <br />taxa were Baetidae and Heptageniidae) were minor components of diets for all fishes <br /> <br /> <br />(< 10% of food volume) except larger red shiner, speckled dace, and green sunfish. <br /> <br /> <br />Red shiner and sand shiner ate more semi-aquatic or terrestrial insects than the <br /> <br /> <br />other fishes. Semi-aquatic insects consumed were primarily larval and adult beetles <br /> <br />(predominant taxa were Heterocercidae and Staphylinidae) and adults of the family <br /> <br />Scelionidae (Hymenoptera). Terrestrial insects consumed were primarily hemipterans and <br /> <br />ants. <br /> <br />All fishes ate zooplankton, but it was particularly important in diets of Colorado <br />squawfish < 31 mm TL (especially < 21 mm TL), green sunfish < 31 mm TL, and, to a <br /> <br />8 <br />
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