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Last modified
7/14/2009 5:02:31 PM
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5/20/2009 10:09:19 AM
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UCREFRP
UCREFRP Catalog Number
7834
Author
Burdick, B. D. a. R. B. B.
Title
Experimental Stocking Of Adult Razorback Sucker In The Upper Colorado And Gunnison Rivers.
USFW Year
1997.
USFW - Doc Type
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following stocking. Radiotagged razorback sucker exhibited similar movement <br />patterns and behavior following stocking at different sites in the San Juan River <br />(Ryden and Pfeifer 1995; 1996). The mean downstream displacement for radiotagged <br />razorback stocked in the spring in the San Juan River was 10.5 miles, compared <br />to 19.3 miles for razorback sucker stocked in the Upper Colorado River and 14.3 <br />miles for fish stocked in the Gunnison River. The mean downstream displacement <br />for radiotagged razorback sucker stocked during the fall of 1994 (54.0 miles) and <br />1995 (58.2 miles) in the San Juan River was greater than those stocked in the <br />spring (Ryden and Pfeifer 1995; 1996). <br />Thirty-four, adult, pond-reared razorback sucker, implanted with both <br />internal and external sonic tags, were stocked in the San Juan River inflow area <br />of Lake Powell in the fall of 1995 and their movements monitored (Karp and <br />Mueller 1996). During the 11 months that contact was maintained, several of <br />these fish exhibited fairly long up- and downstream movements following stocking; <br />others made only one-way movements. Of the fish contacted, all appeared to <br />remain in the inflow area of Lake Powell in the Lower San Juan River following <br />release; none of the tagged razorback sucker made obvious downstream movements <br />into Lake Powell. One fish, after moving downstream 3 miles then moved upstream <br />43 miles; another fish initially moved downstream 19 miles and then returned <br />upstream 29 miles. Both of the upstream movements occurred during spring, and <br />these researchers suggested that not only were the fish seeking certain types of <br />habitats but that movements may be possibly related to spawning behavior. <br />The initial downstream movement of stocked fish may be in response to these <br />fish searching for adequate food resources and riverine habitat (Personal <br />communication, Edmund Wick) or fright and traumatic, behavioral stress related <br />to handling, stocking, and exposure to a new environment (Personal communication, <br />Gordon Mueller). <br />Once passage to upper reaches is more generally available, another <br />alternative would be to stock in lower reaches like lake inflows or extensive <br />connected pond areas in lower stream reaches. U. S. Geological Survey (USGS) <br />researchers plan to further investigate the utility of stocking captive-reared <br />razorback sucker in lower stream reaches near inflow areas (San Juan River arm <br />of Lake Powell) where food availability and productivity is high. Higher water <br />temperatures and greater food availability may make lower stream reaches better <br />for reintroducing captive-reared razorback sucker until more off-channel and <br />floodplain habitat in upper stream reaches are made accessible (Personal <br />communication, Edmund Wick). Stocked razorback sucker can remain in lower <br />velocity, food rich, and warmer feeding areas during reintroduction and move <br />upstream to better spawning habitat when they feel the urge to explore and expand <br />their range. They can learn the river from downstream to upstream instead of <br />being forced downstream by high velocity, low food density, and competition with <br />other river suckers. <br />Reducing fright and traumatic stress related to stocking may be an <br />important factor in the ultimate survival of razorback sucker. USGS researchers <br />will monitor the response and survival of captive-reared razorback sucker stocked <br />in new riverine environments. The test will determine if post-stocking <br />behavioral stress can be reduced and survival increased if fish are allowed to <br />slowly acclimate in a backwater before migrating to other riverine habitats. <br />15
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