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Last modified
7/14/2009 5:02:35 PM
Creation date
5/22/2009 4:56:12 PM
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UCREFRP
UCREFRP Catalog Number
9442
Author
Muth, R. T. and T. E. Czapla.
Title
Workshop Summary
USFW Year
2002.
USFW - Doc Type
Designing Methods to Evaluate Stocked Fish in the Upper Colorado River, Green River, and San Juan River Subbasins.
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<br />capacity to meet San Juan's immediate needs. Colorado pikeminnow produced at the Mumma or <br />24-Road hatcheries in excess of Colorado's plan could be stocked into the San Juan River. <br /> <br />In the San Juan River, we can achieve the recovery goal population target (1,000 age-5+) at <br />current stocking levels (-2,000 age-O Colorado pikeminnow/mile). But the State of New Mexico <br />thinks we could be stocking 100 times as many as we are now. Mortality of eggs and larvae is <br />extremely high regardless of whether they are wild-spawned or hatchery-produced. <br /> <br />Humpback chub <br /> <br />In order to supplement humpback chub populations, the Program would need to devote some <br />hatchery capacity to produce humpback chub. Colorado and Utah humpback chub population <br />estimates, though still being evaluated, suggest declines in some humpback chub populations. <br />The Program has prioritized razorback sucker and bonytail as the highest for reintroduction! <br />augmentation, but the jury is still out on humpback chub. Age-classes of humpback chub are <br />diverse and well-represented. Devoting hatchery space to humpback chub would reduce capacity <br />for higher priority species. But we need tomonitor humpback chub and be prepared to modify <br />stocking plans, if necessary. If necessary, there is humpback chub broodstock available in lower <br />basin. <br /> <br />3.5 Recommendations Regarding Stocking Plans <br /> <br />There should be an integrated Recovery Program stocking plan, rather than separate State plans. <br />The Program Director's office should take the lead in drafting a plan, not a full-blown report, <br />covering at least 2 years of production. The San Juan River should also be included. <br /> <br />4.0 MONITORING REPORTS <br /> <br />4.1 Monitoring and Evaluating Various Sizes of Domestic Reared Razorbacl{ Sucker <br />Stocked in the Upper Colorado and Gunnison Rivers: 1995-2001 (Burdick 2002). <br /> <br />The objectives of this study were to: I) determine the relationship between the size ofrazorback <br />sucker stocked at 100,200, and 300 mm TL and their subsequent survival in the wild; 2) <br />determine the dispersal of stocked fish of various sizes following release over time; 3) detennine <br />habitat use of juvenile/subadult fish in the river; 4) identify ways to reduce mortality of stocked <br />fish; 5) evaluate different gears for sampling juvenile/subadult razorback sucker for future <br />monitoring programs; and 6) provide recommendations for the optimum size(s) for stocking <br />razorback sucker into Upper Colorado River Basin rivers. <br /> <br />Summary of results: <br />49,954 razorback sucker were stocked in the Gunnison and Colorado rivers from <br />1994-200 I (Figure 3). <br />226 razorback sucker were collected between 1996 and 2001. A retum rate of -0.5% of <br />all fish stocked during this period. <br /> <br />11 <br />
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