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Last modified
8/11/2009 11:32:58 AM
Creation date
8/10/2009 5:17:14 PM
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UCREFRP
UCREFRP Catalog Number
9720
Author
U.S. Fish and Wildlife Service.
Title
Razorback sucker (Xyrauchen texanus) genetics management and captive propagation plan, Dexter National Fish Hatchery and Technology Center.
USFW Year
2004.
USFW - Doc Type
Dexter National Fish Hatchery and Technology Center
Copyright Material
NO
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Executive Summary <br />The razorback sucker, Xyrauchen texanus, was listed as an endangered species in 1991 under the <br />Endangered Species Act of 1973, as amended. During the early 20th century the species was <br />abundant and distributed throughout the upper and lower Colorado River basin and its tributaries. <br />The decline of the species to the verge of extinction is attributed to the construction of massive <br />dams and water diversion projects that drastically changed the natural hydrology and aquatic <br />environments of the Colorado River. Competition with, and predation by, introduced nonnative <br />fish also add to the lack of recruitment by wild populations. <br />The Razorback Sucker Recovery Goals (U. S. Fish and Wildlife Service 2002) geographically <br />delineate the management efforts in the Colorado River basin as two recovery units: the upper <br />basin, including the Green River, upper Colorado River, and San Juan River subbasins; and the <br />lower basin, including the mainstem and its tributaries from Glen Canyon Dam downstream to the <br />international boundary with Mexico. The largest and most genetically diverse aggregation of <br />razorbacks resides in the lower Colorado River basin in Lake Mohave, Arizona. This aggregation is <br />considered to be the primary source for genetic material needed to recover the species in the lower <br />basin and perhaps throughout the entire Colorado River basin. The immediate conservation goals <br />for razorback sucker in the lower basin are to avert extirpation of the Lake Mohave population and <br />to conserve it as a genetic resource. Controlled propagation of the species at designated facilities <br />and reintroduction of fish into historic habitats are viable strategies and approaches to prevent <br />imminent loss and reestablish populations. Dexter National Fish Hatchery & Technology Center <br />(Dexter NFHTC) has contributed to the overall conservation effort since 1981. <br />This Genetic Management and Captive Propagation Plan (Plan) describes the guidelines used at the <br />Dexter NFHTC for developing and maintaining razorback broodstocks, experimental populations <br />and refugia maintenance. The Plan focuses primarily on genetic broodstock reserves and captive <br />iv
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