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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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Template:
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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1 <br />morphometric studies should be summarized as soon as possible and incorporated <br />into recovery management goals and reintroduction efforts. <br />I Historical distribution <br />Although several historical accounts describe bonytail throughout the <br />Colorado River system more than 100 years ago (e.g., USFWS 1990; Valdez and <br />Clemmer 1982), the basic biology of G. elegans was not studied in detail until <br />the late 1960's (Vanicek 1967; Vanicek and Kramer 1969; Holden and Stalnaker <br />1970; Vanicek et al. 1970). Early studies focused on the abundance, life <br />history, and distribution of native Colorado River fishes. During this <br />period, bonytail numbers were greatly reduced. Thus, the ecological <br />requirements of the bonytail remain poorly understood. Indeed, anecdotal data <br />on the bonytail were obtained from observations in artificial habitats such as <br />hatchery ponds or reservoirs. Furthermore, the vernacular use of the name <br />'bonytail' in the earliest records undermines factual references on <br />distribution (Banks 1964; Vanicek and Kramer 1969). Therefore the true <br />historical distribution of this species is unknown (Figure 1). The last known <br />concentration of bonytail was in Split Mountain Canyon of the Green River <br />through Dinosaur National Monument, Utah (Vanicek 1967). <br />Current status and trends <br />Very few fish have been captured and positively identified as bonytail <br />in the UCRB since 1980. Valdez (1985) identified 14 possible bonytail that <br />included juvenile and young-of-year fish in Cataract Canyon, Utah. Kaeding et <br />al. (1986) captured one bonytail from the Black Rocks section of the Colorado <br />River, Utah. Tyus et al. (1987) captured one bonytail in Gray Canyon. In <br />1993, a suspected adult bonytail was captured in the Colorado River about four <br /> <br />1
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