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Last modified
7/14/2009 5:02:30 PM
Creation date
5/20/2009 10:08:53 AM
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UCREFRP
UCREFRP Catalog Number
7741
Author
Burdick, B. D.
Title
A Plan to Evaluate Stocking to Augment or Restore Razorback Sucker in the Upper Colorado River - Final.
USFW Year
1992.
USFW - Doc Type
\
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0 <br />released in the river would impinge upon wild populations is <br />reduced. Presently, recruitment in the wild is virtually <br />nonexistent. In combination with the small number of fish that <br />will be stocked under this experimental plan, the opportunity for <br />t spawning with wild fish from other <br />populations in the basin and <br />interspecific hybridization with other catostomids will be <br />reduced. <br />3. Progeny intended for release into the wild will be individually <br />marked at the hatchery. Marked fish will allow individual <br />identification necessary to document population ancestry and will <br />0 allow researchers to measure the effect of hatchery fish on wild <br />populations. <br />4. Hatchery fish initially released will be radiotagged and closely <br />monitored for about 18 months after stocking. <br />5. Prior to leaving the hatchery for release in the wild, fish will <br />be checked for pathogens and parasites that are currently <br />0 evaluated on USFWS fish health forms. <br />Before any large-scale stocking effort occurs the following conditions <br />must be met: <br />1. Genetic studies of wild and domestic populations must be completed. <br />Genetic differences between hatchery-produced and wild populations <br />must be identified and quantified prior to any release if effective <br />monitoring of gene flow is to occur. It is therefore vital that <br />adequate amounts of this kind of genetic information be available <br />both for hatchery populations and for wild populations. <br />2. Genetic risks of stocking hatchery fish are identified and <br />15 <br />D
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