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WSPP336
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WSPP336
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Last modified
1/26/2010 4:16:11 PM
Creation date
4/23/2007 10:00:42 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8240.200.10.H
Description
Colorado River Threatened-Endangered - UCRBRIP - Program Organization-Mission - Stocking
State
CO
Basin
Colorado Mainstem
Water Division
5
Date
2/4/1998
Author
DOI-FWS
Title
Management-Control of Non-Native Fish Species in Floodplain Ponds Along the Upper Colorado and Gunnison Rivers - Final Environmental Assessment-Finding of No Significant Impact - 02-04-98
Water Supply Pro - Doc Type
Report/Study
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<br />000574 <br /> <br />The Recovery Program consists of five major elements for recovery of <br />endangered fishes in the Upper Colorado River Basin: (1) provision of <br />in-stream flows; (2) habitat development and maintenance; (3) native <br />fish stocking; (4) management of nonnative species and sport fishing; <br />and (5) research, monitoring, and data management (U.S. Fish and <br />Wildlife Service 1987a, 1987b). <br /> <br />Representatives of the cooperating agencies and organizations serve on <br />several committees to oversee the Recovery Program within the framework <br />of the Endangered Species Act, existing states' water rights, and terms <br />of the Colorado River compacts (Rose and Hamill 1988). All decisions <br />by the Recovery Program participants are made on the best available <br />information and refined as new information becomes available using the <br />adaptive management approach (Walters and Hillborn 1978; Walters 1986). <br /> <br />2. Recovery Issue Discussed in this Draft Environmental Assessment. Human <br />alteration of the Upper Colorado River and its tributaries had a major <br />negative impact on some of the native fishes -- to the point where they <br />are now listed as endangered. Some of the native fishes, adapted to the <br />highly variable aquatic environment of the natural ecosystem, are still <br />able to maintain self-sustaining populations, despite the drastic <br />altered state of the present river environment. In less altered river <br />reaches, native fish species dominate the fish fauna (Anderson 1997; <br />Burdick 1995) while, in more altered reaches, nonnative fish species are <br />more successful (Miller et ale 1982; Tyus et ale 1982). <br /> <br />(A) Introduction of Nonnative Fishes in the Upper Colorado River Basin <br />and Impacts on Native Fishes. The introduction of fish species <br />not native to the Colorado River Basin began in the late 1800's. <br />Such introductions occurred for a variety of reasons including <br />establishment of sport fish populations, forage for the sport fish <br />species, biological control of unwanted pests, aesthetic or <br />ornamental purposes, release of unwanted pets or bait fish, and <br />accidental releases (Taylor et ale 1984). Some of these <br />introductions were not successful in becoming established while <br />other introductions resulted in establishing self-sustaining <br />populations in various parts of the Upper Colorado River Basin. <br />The species composition of a fish community can be altered <br />dramatically and quickly. For example, pre-impoundment <br />investigations of Taylor Draw Dam on the White River, Colorado in <br />1983-1984 was dominated (97%) by native fishes above, within, and <br />below the reservoir basin. By 1989-1990, nonnative fishes <br />comprised 90% of the fishes collected in the reservoir and 80% of <br />the fishes collected in the river below the dam (Martinez et ale <br />1994). Generally, the successful nonnative fishes expanded their <br />ranges throughout the Upper Basin wherever habitats were suitable <br />to them. Some nonnative fishes have been repeatedly stocked to <br />offer recreat i ona 1 fi shi ng opportunities by Federal and State <br />agencies, commercial enterprises, and private citizens. <br /> <br />(B) Impacts of Nonnative Fish Introductions on Native Fishes. The <br />impacts of nonnative fish species on native fishes depends upon <br /> <br />5 <br />
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