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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.
Copyright Material
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<br />Colorado & Gunnison Rivers <br />Of 84 RZ Stocked and Later Captured--1997-2001 <br />(at large for at least G months post-stocking) <br /> <br />Size at Release <br /> <br />, <br />Size at Capture <br /> <br />E <br />E <br />- <br /> <br /> <br />.c <br />i <br />~ <br />j <br />~ <br /> <br />< 100 <br />100-149 <br />150-199 <br />200-249 <br />250-299 <br />300-349 <br />350-399 <br />400-449 <br />450..499 <br />500-549 <br />550-599 <br />> 599 <br /> <br />35 30 25 20 15 10 5 0 <br /> <br />Num ber of Fish <br /> <br />5 10 15 20 25 <br />Number of Fish <br /> <br />Figure 4. Recaptures of stocked rawrback sucker in the Colorado and Gmmison rivers, <br />1997-2001. <br /> <br />Recommendations <br />Stock razorback sucker at a minimum of 200 mm TL. <br />Monitor stocked razorback sucker following release to detennine survival, dispersement, <br />river-reach retention, distribution, density, and mortality causes. <br />Continue marking razorback sucker stocked in the wild. <br />Monitor reproduction contribution to the adult razorback sucker population. <br />Detennine if maximum genetic diversity is being maintained in offspring sjmilar to wild <br />stock and if inbreeding is occurring. <br />Temper transport water and add salt. <br />Site acclimate stocked razorback sucker (e.g., 2-3 days). <br /> <br />Uncertainties <br />Actual survival rates of stocked fish. <br />Time of year to stock razorback sucker to yield the best survival. <br />Whether stocked razorback sucker will recruit into the adult population. <br />Whether stocked fish reproduce in the wild. <br />Whether stocked fish will be retained in reaches where suitable habitat for razorback <br />sucker reproduction may be available, or whether stocked fish have the ability to migrate <br />to those habitats. <br /> <br />13 <br />
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