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Last modified
7/14/2009 5:02:33 PM
Creation date
5/22/2009 4:52:15 PM
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UCREFRP
UCREFRP Catalog Number
8114
Author
Nesler, T. P.
Title
Five-year Stocking Plan for Endangered Colorado River Fish Species in Colorado.
USFW Year
1998.
USFW - Doc Type
Denver, CO.
Copyright Material
NO
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<br />passage structure by smaller, late juvenile Colorado pikeminnow in 1996 (1 fish), 1997 (16 <br />fish) and 23 fish in 1998 may be intetpreted as preliminary support of this dispersal! <br />recruitment hypothesis. Without benefit of passage at the Colorado River barriers above <br />Palisade, similar translocation of Colorado pikeminnow captured below the barriers should be <br />considered. <br /> <br />Natural recolonization of the upper Colorado River reach is also possible with the <br />placement of passageways around existing barriers similar to Red1ands on the Gunnison, but <br />the success of these devices in tenns of use by Colorado pikeminnow has yet to be <br />established, both in tenns of numbers of fish and the contribution of observed rates of <br />passage (e.g. number of fish per season) to population goals for the Gunnison River or <br />recovery goals for the species. Similar to the translocation approach, though perhaps even <br />more variable in tenns of progress, natural recolonization would likely require a long time <br />period to establish an adult population of even 4 fish/mile (200 fish total) similar to the <br />Grand Valley reach now, or the 10 fish/mile target proposed here from the Anderson (1997) <br />biomass results. So that the Recovery Program may achieve progress toward recovery goals <br />in a timely manner, we recommend the stocking of genetically compatible Colorado <br />pikeminnow as the primary approach to extending the species range and establishing adult <br />populations within the unoccupied reach of the upper Colorado River and in the Gunnison <br />River. We further recommend that translocation of wild Colorado pikeminnow of the <br />appropriate life stagel size group also occur as a supplementary approach, using fish captured <br />in the plunge pools and immediate downstream reaches below the instream barriers at <br />Redlands on the Gunnison River and Price-Stubb and Highline on the Colorado River. This <br />management action should be initiated as soon as possible, even prior to stocking and <br />passageway installation. Finally, we recommend the use of artificial passageways to <br />facilitate the movement of wild Colorado pikeminnow into the target reaches receiving <br />stocked fish. <br /> <br />The stocking numbers proposed here are based on biomass estimates of fishes in the <br />Colorado River in Anderson (1997) and survivorship curve estimates in Table 4. The goal <br />would be for reintroduction stocking to result in a multi-year class population at a desired <br />density of 10 fish/mile. Assumptions made that influence stocking numbers and target <br />reaches include: <br /> <br />1) Populations of Colorado pikeminnow extended naturally upstream prior to placement <br />of the instream barriers within the Colorado and Gunnison rivers, and were comprised <br />largely of adults, similar to the size and age composition of Colorado pikeminnow <br />populations in other Colorado tributary streams. Burdick (1995) documented the <br />existence of a remnant population of adult Colorado pikeminnow in the Gunnison <br />River upstream of Redlands Diversion Dam. An anecdotal account exists of the <br />capture, by angling, of a IS-inch Colorado pikeminnow, above Glenwood Springs on <br />the Colorado River (Pressey 1968). <br /> <br />14 <br />
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