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Last modified
7/14/2009 5:02:36 PM
Creation date
5/17/2009 11:46:44 PM
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UCREFRP
UCREFRP Catalog Number
9528
Author
Martinez, P. and N. P. Nibbelink.
Title
Colorado Nonnative Fish Stocking Regulation Evaluation.
USFW Year
2004.
USFW - Doc Type
Grand Junction, Laramie.
Copyright Material
NO
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<br /> <br />1 <br /> <br /> <br /> <br />11 <br /> <br /> <br />necessary to lessen human or naturally caused perturbations. There <br />would be periodic mixing of fish between long-term habitats in accordance <br />with a genetic management plan, but no other movement of fish would <br />occur. The fish from these habitats would contribute to genetic diversity <br />during periodic mixing with mainstem populations. <br />2. Production habitats are designed to raise wild-born or hatchery- <br />produced fish to stocking size for release into the mainstem populations or <br />to establish long-term habitats. When a large number of fish suitable for <br />stocking are present they would be harvested and released. The facility <br />would then be re-stocked to initiate another production cycle. <br />Requisite to the success of this plan is the continued maintenance of these <br />isolated habitats. This includes periodic evaluation and renovation of habitats <br />and their fish populations as follows: <br />' 1. It is anticipated that, over time, nonnative fish species will invade the <br />isolated habitats. The interactions of the native and nonnative fishes in <br />the habitats will be studied, particularly with regard to the larger nonnative <br />' predators, to assess interactions between species. Renovations to <br />remove the nonnative fish from native fish habitats will occur as needed. <br /> <br /> <br />i <br /> <br /> <br /> <br /> <br /> <br />2. Repeated translocations of native fish from the habitats will be <br />necessary with attendant needs for genetic, population, and production <br />planning. The types and frequencies of fish movement will vary depending <br />on planning needs and the type of habitat involved. <br />3. Physical maintenance of the habitats will be necessary over the life of <br />the plan. Construction of new habitats and rehabilitation of existing <br />habitats will require dry-land excavation or dredging to provide proper <br />water depths and bottom contours, eliminate excess marsh vegetation <br />encroachment, and maintain inlet and outlet works. Habitats will be <br />physically managed in concert with wetland and riparian restoration <br />programs to enhance ecosystem values. <br />Strategy 3: Unique Opportunities <br />The third strategy exploits unusual circumstances. Original persistent adult <br />reservoir populations of "big-river" fish in the lower Colorado River reservoirs <br />10 <br />
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