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2022-12-19_GENERAL DOCUMENTS - C1981010
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2022-12-19_GENERAL DOCUMENTS - C1981010
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Last modified
12/20/2022 1:58:51 PM
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12/20/2022 10:30:12 AM
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DRMS Permit Index
Permit No
C1981010
IBM Index Class Name
General Documents
Doc Date
12/19/2022
Doc Name Note
Section 7 Consultation.
Doc Name
Correspondence
From
Clayton Creed
To
DRMS
Email Name
RAR
JLE
Media Type
D
Archive
No
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Basin Recovery Implementation Program 2010). Since 1996, over 380,000 tagged bonytail <br /> subadults have been stocked in the Green and upper Colorado River subbasins. <br /> To date, most stocked bonytail do not appear to survive very long after release into a given river. <br /> To date,the bonytail stocking program has not been as successful as the razorback sucker <br /> stocking program. Researchers continue to experiment with pre-release conditioning and <br /> exploring alternative release sites to improve their survival. Since 2009, an increasing number of <br /> bonytail have been detected at several locations throughout the Upper Colorado River Basin <br /> where stationary tag-reading antennas are used. During high spring flows in 2011,more than <br /> 1,100 bonytail (16.6 percent of the 6,804 stocked in early April of that year)were detected by <br /> antenna arrays in the breach of the Stirrup floodplain on the Green River. The Price Stubb <br /> antenna array on the Colorado River detected 138 bonytail between October 2011 and September <br /> 2013. The fish detected in fall 2011 had been stocked above Price-Stubb in Debeque Canyon, <br /> but in spring 2012, some of those fish were moving upstream through the fish passage. <br /> 2.4.4 Threats <br /> The bonytail was designated as an endangered species under a final rule published <br /> April23, 1980, (45 FR 27710-27713). Reasons for decline of the species were identified as the <br /> physical and chemical alteration of their habitat and introduction of exotic fishes. The 1990 <br /> Bonytail Chub Recovery Plan further stated that the decline of the bonytail chub is attributed to <br /> stream alteration caused by construction of dams, flow depletion from irrigation and other uses, <br /> hybridization with other Gila, and the introduction of nonnative fish species. Hence, the primary <br /> threats to bonytail populations are streamflow regulation and habitat modification (including <br /> cold-water dam releases,habitat loss, and blockage of migration corridors); competition with and <br /> predation by nonnative fish species; hybridization; and pesticides and pollutants (Service 2002d). <br /> No new threats have emerged since the 2002 recovery goals were published. The Service's <br /> status review of bonytail completed in 2012 (USFWS 2012c)reported that 72 percent of the <br /> recovery factor criteria(USFWS 2002d)have been addressed to varying degrees. <br /> Overall, the threats to the bonytail from nonnative fish are similar to those facing the Colorado <br /> pikeminnow, as described above. See the discussion on threats to the Colorado pikeminnow <br /> above for further information, particularly regarding the threat to all endangered fish due to <br /> predation from nonnative species. <br /> No known wild, self-sustaining populations of bonytail exist in the Upper Colorado River Basin. <br /> Since listing, bonytail were stocked in the Upper Basin to augment populations, but recruitment <br /> and natural reproduction have not been documented. Recent recaptures of bonytail in the Green <br /> and Colorado Rivers a year after stocking provide promising results that individuals are <br /> surviving. <br /> To summarize,bonytail habitat loss and degradation from dams and diversions constructed <br /> decades ago posed some of the early, primary impacts to the species. Most of the long-term <br /> impacts from these structures continue and are unlikely to change significantly in the near term. <br /> In the remaining suitable habitats, nonnative fish species pose a significant ongoing threat and <br /> 30 <br />
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