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<br />Recommended Conservation Measures
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<br />Reclamation will monitor the population and its habitat both pre- and post-1997 Fall Test flow, to
<br />document the level of incidental take statement, and to assist in defining the species' response to
<br />the event and in refining a take level.
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<br />According to Me, Mike Demlong of the Phoenix Zoo, KAS can be housed in terraria as interim
<br />habitat immediately, then moved to permanent facilities when they are completed, Snails which
<br />are in danger of take during the proposed flow can be salvaged according to the protocol
<br />developed by the working group and placed at to the zoo,
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<br />RAZORBACK SUCKER OCvrau~hen tennus (Abbott))
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<br />Species Information
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<br />The razorback sucker was listed as an endangered species by the U,S, Fish and Wtldlife Service
<br />(Service) on October 23, 1991 (56 FR 54957), The species is under protection of the
<br />Endangered Species Act of 1973 (Public Law 97-304), as amended, Prior to this listing, the
<br />razorback sucker was classified as a candidate species - category 1, It was proposed for listing
<br />as a threatened species on April 23, 1978 (43 FR 17375), but the petition was withdrawn in 1980
<br />because of a failure to designate critical habitat and the requirement to complete the listing
<br />process within 2 years, A draft recovery plan was prepared June 24, 1996 and a revised draft is
<br />being reviewed in 1997, Critical habitat was designated for the razorback sucker and three other
<br />Colorado River fishes (i,e" Colorado squawfish, humpback chub, bonytail) on March 21, 1994
<br />(59 FR 13374), The Service designated 15 reaches in the Colorado River Basin.as critical habitat
<br />for razorback sucker, for a total of 1,724 miles. This represents about 49"10 of the historic range
<br />of the species and includes portions of the Colorado, Green, Yamp&, White, Gunnison, Duchesne,
<br />and San Juan rivers in the upper basin, and the Colorado River in the lower basin. Critical habitat
<br />in the lower basin extends from the contluence of the Paria River to Hoover Dam, including Lake
<br />Mead to full pool elevation. Hence, all of Marble and Grand canyons are included.
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<br />Description
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<br />The razorbac1c sucker is distinguished from all other suckers by a bony ridge or keel rising
<br />abruptly behind the head and extending to the base of the dorsal fin (Minckley 1973), The keel is
<br />formed by the growth and fusion of three interneural bones located just behind the head (Snyder
<br />and Muth 1988). The appearance of the keel on razorbacks varies with size of fish, and may be
<br />evident on individuals as small as 100 mm TL, For years, this species was called the "humpback
<br />sucker", because of the large dorsal keel. The razorback sucker is an elongated and robust fish
<br />with a prominent, ventral sucker mouth. There are usually 14 or 15 rays in the dorsal fin and 7 in
<br />the anal fin, The scales are well developed with 68.87 in the lateral line. The body is dark brown
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