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Last modified
7/14/2009 5:02:35 PM
Creation date
5/22/2009 6:55:41 PM
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UCREFRP
UCREFRP Catalog Number
9408
Author
Foster, D. K. and G. Mueller.
Title
Movement Patterns, Behavior, and Habitat Use of Razorback Sucker Stocked Into the Green River at Canyonlands National Park, Utah.
USFW Year
1999.
USFW - Doc Type
Open-File Report 99-107,
Copyright Material
NO
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<br />The remaining fish (2E, 3C, 6C, 8C, 12C, 13C, 14C, and 15C) all moved continuously <br />downstream and entered Lake Powell. <br />Individual Movements -Estimated Rates of Movements <br /> Only 17 of the 23 razorback suckers that were located following their release were <br /> contacted a sufficient number of times to estimate their daily rates (km/day) of movement <br /> (Figures 3A and 3B). Six razorback suckers (10E, 1C, 3C, 4C, I lC, and 14C) were <br /> located just twice during the 58 days of tracking. The remaining 11 fish were contacted <br /> between 3 and 7 times. The general trend was for the initial movement offish to be at a <br /> high rate of ~5 km/day and decrease over time to near 0 km/day. <br /> However three razorback suckers increased their estimated daily rate of movement over <br /> time. Fish l OE and 1 C increased their daily movements from ~3 km/day during the first <br />f <br />d <br />f <br />l <br /> ew <br />ays <br />o <br />lowing release to ~5 km/day by day 10. Contact was lost with both fish by <br /> day 12, so it will remain unknown if their rate of movement attenuated over time as <br /> occurred in the majority of the razorback suckers. Fish 2C, the third razorback sucker to <br /> have an increased daily movement rate over time, decreased its daily movements from <br /> ~5 km/day during days 1 to 8 to near 0 km/day during days 30 to 58. However, a burst of <br /> movement occurring during day 29 resulted in a positive slope (Figure 3B). <br /> The direction of the estimated daily movement rates for the suckers can also be seen in <br /> Figures 3A and 3B. Positive data points designate upstream movements, whereas <br /> negative data points designate downstream movements. Only two suckers with greater <br /> than two contacts increased their rate of downstream movement over time. As previously <br /> mentioned, fish 2C moved down the Green River and then up the Colorado River <br /> 24.9 km. Fish 2C then began a fairly rapid movement downstream and entered Lake <br /> Powell. This rapid, mid-study, downstream movement resulted in a negative slope for <br />2C's average directed rate of movement over the course of the study period. Fish SE also <br /> increased its rate of downstream movement over time. Fish SE moved out of the Green <br /> River in approximately 8 days traveling at ~8 km/day (Appendix 1). Fish SE then made a <br /> 55.8-km movement up the Colorado River between days 7 and 12 at ~12 km/day. <br /> Upstream movement continued at a reduced rate (~3 km/day) until day 19, at which point <br /> SE moved downstream at ~-7 km/day and contact was lost 4.8 km above the Green River <br /> confluence. This trend in daily movements from large upstream, to small upstream, to <br /> large downstream resulted in the trend of SE increasing downstream movements over <br /> time. <br />Individual Movements -Fish Condition Factor (K) <br />The movement patterns of razorback suckers did not a ear to be de endent u on the <br />PP P P <br />condition factor [K = (weight* 100/length3)]. Condition factors (K) ranged between 0.734 <br />and 1.057, and were not correlated with length (p = 0.97, regression analysis) but were <br />11 <br />1 <br />
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