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Last modified
7/14/2009 5:02:33 PM
Creation date
5/20/2009 10:54:03 AM
Metadata
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UCREFRP
UCREFRP Catalog Number
8101
Author
Lentsch, L. D., Y. Converse, P. D. Thompson, D. T. A. Crowl and D. C. A. Toline.
Title
Bonytail Reintroduction Plan for the Upper Colorado River Basin - Final Report.
USFW Year
1996.
USFW - Doc Type
Salt Lake City, Utah.
Copyright Material
NO
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<br />preferred boulder substrate that offered cover. Specifically, they occupied <br />velocities of approximately 0.06 m/s near current and remained near the bottom <br />of tanks. In general, Bissonette and Crowl (1995) suggested that age-1 <br />bonytail appear to select localities near moderate velocity, more turbulent <br />areas, while both resting and feeding, always remaining near the substrate. <br />' Their observations are similar to those reported by Vanicek and Kramer (1969) <br />I and Valdez (1985). <br />Feeding <br />Stomachs of adult bonytail indicated that they feed mainly on <br />terrestrial insects, plant debris, and algae. Bonytail were suspected to be <br />mainly surface feeders in runs or glides, whereas roundtail chub feed mainly <br />on aquatic insects and are occasionally piscivorous (Vanicek 1967; Vanicek and <br />Kramer 1969; Minckley 1973). Vanicek and Kramer (1969) found that young Gila <br />stomachs contained chironomids and ephemeroptera larvae. Bissonette and Crowl <br />(1995) found that age-1 bonytail were observed to feed very much like trout in <br />laboratory flumes, occupying a station near the substrate (rather than near <br />surface), near or in the thalweg, passively feeding on drifting material. <br />This change in feeding may indicate an ontogenetic switch in feeding behavior <br />from benthic to more general or pelagic feeders. However, laboratory results <br />did not represent natural allopatric feeding conditions which may also affect <br />the feeding behavior of young fish. <br />Reproduction <br />Vanicek and Kramer (1969) found bonytail in spawning condition after <br />water temperatures reached 18°C on the descending limb of spring peak <br />hydrograph. The most successful spawning occurred during the highest <br /> <br />12 <br />
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