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Last modified
7/14/2009 5:02:34 PM
Creation date
5/22/2009 4:43:58 PM
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UCREFRP
UCREFRP Catalog Number
9350
Author
Hawkins, J., T. Modde and J. Bundy.
Title
Ichthyogauna of the Little Snake River, Colorado, 1995 with Notes on Movements of Humpback Chub.
USFW Year
2001.
USFW - Doc Type
Denver.
Copyright Material
NO
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<br />vi <br /> <br />I <br />I <br />I <br />I <br />J <br />I <br />II <br />I <br />Ii <br />,I <br />f <br />I <br />, <br />I <br />I <br />I <br />I <br />il <br />t <br /> <br />were captured in high-velocity, recirculating eddies and Colorado pikeminnow were <br />captured in eddies or shorelines. Two humpback chub were implanted with <br />transmitters in mid-June and early July and both demonstrated fidelity to specific <br />eddies in the Little Snake River until late July when they moved to the Yampa <br />River. Both telemetered humpback chub moved 5.6 and 14.5 km out of the Little <br />Snake River, into the Yampa River, and continued downstream an additional 26 and <br />24 km into Yampa Canyon. Total distances moved were 32 to 39 km and their <br />final destinations were within 2 km of each other. These long-distance movements <br />were similar to movements by humpback chub in the Grand Canyon for spawning <br />and similar to distances that humpback chub move between population groups in <br />Westwater Canyon, Utah and Black Rocks, Colorado in the Colorado River. Both <br />telemetered humpback chub remained in the Little Snake River while average daily <br />temperatures were 1-2 Oc warmer than in the adjacent Yampa River. They left the <br />Little Snake River when this relationship reversed and average daily temperatures in <br />the Yampa River became warmer and just before flows reached baseflow levels in <br />the Little Snake River. Humpback chub occupied the Little Snake River during their <br />spawning period and moved a relatively long-distance if they originated in the <br />Yampa River. These observations are significant because they support the <br />possibility that humpback chub might be attempting to spawn in the Little Snake <br />River. Spawning success was not confirmed by accepted methods such as the <br />collection of spawning fish, juveniles, or larvae; although 14 larval Gila were <br />collected, they were too small to use conventional morphometric characteristics to <br />identify them to species. Gila larvae may require genetic analysis to confirm <br />species identification. Spawning success of humpback chub will be difficult to <br />detect if spawning fish are few resulting in small numbers of larvae that could <br />quickly drift out of the Little Snake River. <br />
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