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WSPC01801
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WSPC01801
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Last modified
1/26/2010 11:14:18 AM
Creation date
10/9/2006 3:01:46 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
3/10/1994
Author
DOI-FWS
Title
Interim Procedures for Stocking Non-Native Fish Species in the Upper Colorado River Basin - 03-10-94
Water Supply Pro - Doc Type
Report/Study
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<br />0023[;7 <br /> <br />Appendix A. <br />Explanation of criteria and <br />Justification for routine stoc~ing of Species <br />in Table 1 of Nonnative Stoc~ing Procedures <br /> <br />Salmonids currentlv in the basin: potential interaction limited due to <br />salmonids preference for cold water. Only artificial creation of suitable <br />salmonid habitat allows these fishes to be found in historic habitat of <br />endangered fishes. Warm water temperatures during the summer would preclude <br />their survival in most of the occupied endangered species habitat. While <br />salmonids are routinely collected in occupied habitat in upper basin.rivers <br />prior to the onset of high summer temperatures, they would more li~ely be prey <br />than predator in these cases. Most li~ely association would be with adult <br />Colorado squawfish in the Green and Colorado Rivers or major tributaries. <br /> <br />Trioloid arass caro: certificate of triploid sterility required before <br />stocking. Stocking sites must be isolated or screened from receiving rivers <br />to prevent escapement. Very few triploid grass carp have been captured in the <br />river as a result of past stoc~ing in isolated ponds. <br /> <br />Redside shiner: currently used as forage in some Wyoming ponds above <br />Flaming Gorge Dam; not li~ely to pass through reservoir environment and outlet <br />works (deep reservoir release at Flaming Gorge Dam precludes virtually all <br />warm-water fish escapement). <br /> <br />Threadfin shad: already well established in lake Powell; not likely to <br />migrate and redistribute upstream due to hostile riverine environment for this <br />species in Cataract Canyon. <br /> <br />Fathead minnow: routine stocking restricted to waters outside of the 100 year <br />floodplain is based on recent information showing competition between young- <br />of-the-year Colorado squawfish and fathead minnow. <br /> <br />Smallmouth bass: above Flaming Gorge--same rationale was provided for redside <br />shiner (outlet wor~s preclude virtually all warm-water fish escapement); <br />stoc~ing allowed in standing waters separated from occupied endangered species <br />habitat (by water containing established reproducing smallmouth populations) <br />based on the premise that this stocking will not contribute additional <br />smallmouth to occupied habitat above what are already supplied by self- <br />sustaining populations in riverine or mainstem impoundment. <br /> <br />Black craooie/blueaill/larQemouth bass: stocking allowed in isolated ponds <br />and reservoirs above the 40-year floodplain with no surface water connection <br />to rivers in the upper basin to prevent escapement into areas where they can <br />compete with or prey upon endangered species. Separation from occupied <br />habitat criteria rationale same as for smallmouth bass. These species are not <br />well adapted to hostile riverine environment and do not appear to establish <br />self-sustaining populations in rivers upon escapement. <br /> <br />Strioed bass; already well established in lake Powell; not likely to migrate <br />and redistribute upstream due to hostile riverine environment for this species <br />in Cataract Canyon. <br /> <br />15 <br />
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