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Last modified
7/14/2009 5:02:36 PM
Creation date
5/22/2009 4:53:25 PM
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UCREFRP
UCREFRP Catalog Number
9498
Author
Nesler, T. P.
Title
Stocking Plan for Endangered Coloraod River Fish Species.
USFW Year
2001.
USFW - Doc Type
Denver.
Copyright Material
NO
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />. <br /> <br />Colorado pikeminnow and streamside-spawntaking methods. The spawning objective is to make <br />uniquely paired matings with resulting egg lots from each pair. <br /> <br />Sixteen humpback chub were collected in September 1995 at Black Rocks from the <br />Colorado River in Colorado near the state line. None of these fish continue to survive in <br />captivity. The pU1J>ose of this collection was to create a refugia population to safeguard genetic <br />material in the event of a catastrophic loss in the Black Rocks population. No broodstock <br />development or reintroduction objectives have been identified for humpback chub in the Upper <br />Basin due to the relative stability of four existing populations in the Yampa, Desolation-Gray, <br />Black Rocks, Westwater and Cataract Canyon sites, as well as a relatively large fifth population <br />in the Colorado and Little Colorado Rivers in the Grand Canyon. <br /> <br />This plan is intended to describe restoration stocking needs anticipated for the listed fish <br />species for rivers and river reaches within the Upper Basin in the state of Colorado. Stock <br />numbers needed over the next seven to nine years were estimated according to the species' <br />abundance objectives within the draft recovery goals. With the decision to modify stocking <br />objectives to be in concert with draft recovery goal population abundance criteria, revision of the <br />existing plan in Colorado will result in a significant modification to long teon fish propagation <br />needs and facilities needs to produce the fish required to meet these stocking objectives. The plan <br />will present required objectives, justification and risk assessment for each species' proposed <br />stocking scenario. <br /> <br />Stocking Objectives and Relation to Recovery Objectives <br /> <br />1) To restore populations of razorback sucker; bonyt~il, and Colorado pikemil1iiOW to <br />unoccupied river reaches within Colorado, <br />2) To augment very small populations of razorback sucker and Colorado pikeminnow in <br />occupied river reaches in Colorado, <br />3) To establish populations of these three fish species comprised of at least three adult age <br />groups at the recovery goal population abundance level. <br /> <br />The context for defining self-sustaining populations, including the abundance criterion in recovery <br />goals for these fish species has been covered extensively in Nesler (2000) and USFWS <br />(2001a,b,c,d in draft). The rationale and justification will not be reiterated here. Also, the <br />Recovery Program's Genetics Management Plan (Wydoski 1995, Czapla 1999) provides <br />guidelines for managing genetic stocks of these species and recommends genetic stock and river <br />reach priorities. With achievement of the three objectives above, the fundamental building blocks <br />for naturally-functioning and self-sustaining populations will have been created. The <br />establishment of stocked, adult fish populations will contribute to recovery via expanded <br />distribution and greater abundance of these species in presently occupied, unoccupied and isolated <br />habitats, and contribute to further reduction of extinction probability for these species. Presence <br />of these stocked populations will contribute to recovery by making it possible to identify limiting <br />factors pertaining to spawning, reproduction, survival, and recruitment that cannot be assessed , <br /> <br />3 <br />
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