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Last modified
7/14/2009 5:02:37 PM
Creation date
5/22/2009 6:49:02 PM
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UCREFRP
UCREFRP Catalog Number
9688
Author
Upper Colorado River Endangered Fish Recovery Program.
Title
Nonnative Fish Control Workshop Summary, Conclusions, and Recommendations.
USFW Year
2002.
USFW - Doc Type
Lakewood, CO.
Copyright Material
NO
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<br />Service and the States of Colorado, Utah, and Wyoming to review and regulate all stockings <br />within the Upper Colorado River Basin in order to reduce the introduction and expansion of <br />nonnative fishes. This agreement prohibits releases of nonnative fishes within the 50-year flood <br />plain of the river, and remains in effect throughout the life of the UCRRP. The agreement <br />provides security against State or Federally endorsed programs introducing new species into the <br />system or increasing the numbers or distribution of existing species. The agreement also allows ' <br />the States to regulate- and restrict stocking of privately owned ponds: These procedures are also <br />expected to reduce the likelihood of new parasites and diseases being introduced through <br />nonnative fish stockings. ' <br />The Stocking Procedures are intended as a way to integrate recreational fishery management with <br />recovery efforts. Four categories of nonnative stockings were identified: , <br />• routine stocking of fishes that currently occur into managed sport fisheries; <br />• case-by-case stocking of fishes that currently occur, but are not necessarily <br />managed as sport fisheries; ' <br />• stocking of new fish species; and <br />• prohibited stockings. <br />2.5 Nonnative Fish Control Strate , <br />gY <br />A nonnative fish workshop was held in the Upper Colorado River Basin on September 13, 1996. <br />As a result of the workshop, a strategic plan was developed to facilitate recovery of endangered <br />fishes by controlling introductions and proliferation of nonnative, nonsalmonid fishes (Tyus and <br />Saunders 1996). Control was defined as reducing numbers of nonnative fishes to the point where , <br />those species no longer are an impediment to recovery. An important aspect of the strategic plan <br />is that the level of reduction should be specified to provide a measure of success. The ultimate <br />aim of the'strategic plan is to increase distribution and abundance of endangered fishes. <br />Three basic themes of control scenarios were identified in the strategic plan: <br /> <br />I . Prevent nonnatives from entering the system by: ' <br />a. Installing escapement controls on some major reservoirs or other sources <br />areas; problematic species were identified as common carp, northern-pike, <br /> <br />smallmouth bass, and black crappie. ' <br />b. Applying chemical treatments to ponds in floodplains. <br />2. Remove nonnative fishes from the main river channel by: ' <br />a. Applying mechanical techniques (e.g., trapping, electrofishing, increased <br />recreational angling or implement commercial harvest). <br />b. Flow management has the potential for reducing centrarchids and small- ' <br />cyprinids, but cause-effect relationships need to be evaluated. <br />3. Exclude nonnative fishes from interactions with larvae and juveniles of native <br />fishes by: ' <br />a. Active management of inundation cycles-for backwaters and floodplain <br />habitats. <br />b. Install barriers, weirs, etc. in high-priority areas. , <br /> <br /> <br />
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