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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 /> i <br />h <br /> n s <br />arp contrast to the more widely used technique of surgically implanting radio <br /> transmitters. This method can lead to substantial fish mortality due to chronic infection <br /> of the abdominal dermis surrounding the exit hole created by the trailing whip antenna. <br /> However, some of the new transmitters employ an internal, coiled antenna that eliminates <br /> the exit hole but also decreases the detection distance. Implanted transmitters will remain <br /> inside fish for the remainder of their lives, while externally attached transmitters will <br /> likely be shed soon after the research project is complete. <br />~' <br /> Immediately following transmitter attachment, fish were alternately assigned to be either <br /> control or experimental treatment. A block net was placed at the mouth of Millard <br />Bottom backwater, and experimental fish were released behind the blocking net and <br /> confined to the backwater while control fish were placed adjacent to the blocking net on <br /> the river side. Due to time and boat limitations, transmitters were only attached to 15 <br />suckers (7 experimental, 8 control) and released on the evening (1815 to 2003 hrs) of <br /> June 16, while the remaining fish (8 experimental, 7 control) were released the next <br /> morning (0900 to1047 hrs). The block net was removed at 0640 hrs on June 19. Thus <br /> the period of time that the first seven experimental fish spent in the backwater (~ 2.5 <br /> days) was greater than the second group of eight fish (~1.9 days). <br />Tracking Design and Effort <br />Razorback sucker positions were recorded using a 40-MHZ ATS© receiver, a whip <br />antenna, and ahand-held directional loop antenna. The previously mentioned National <br />Pazk Service 5.5-m Achilles inflatable boat with a 60-hp jet outboard was used <br />throughout the summer for surveys. For each fish located, the RK was recorded and <br />habitat was described (see next section). <br />The study site was in Canyonlands National Park, Utah, and extended into the Colorado <br />and Green Rivers outside of the park (Figures 1). Twenty-two field surveys were <br />conducted between June 24 and August 13 (Table 1). Thirteen of the 22 surveys <br />repeatedly surveyed 3 reaches of river that were observed to contain radio-tagged <br />razorback sucker. The first of these reaches was Mineral Bottom (RK 81.7) to Spanish <br />Bottom on the Green and Colorado Rivers. Spanish Bottom is located 6.4 km below the <br />confluence of the Green and Colorado Rivers and lies 0.75 km upstream from the start of <br />Cataract Canyon rapids. The Mineral Bottom to Spanish Bottom section was surveyed <br />five times (June 24 and 30, July 9, and August 5 and 7). The second reach was Potash <br />boat dock (RK 77.1) to Spanish Bottom on the Colorado River. Potash to Spanish <br />Bottom was also surveyed five times (July 1, 8, 13, and 30, and August 13). The third <br />reach was on Lake Powell from Hite Marina (RK 270.6) to the base of the Cataract <br />Rapids at Imperial Canyon (RK 322). The river kilometer "zero point" below the <br />confluence of the Green and Colorado Rivers is at Lee's Ferry; the confluence is <br />~. considered to be RK zero if you are upstream in either the Green or Colorado Rivers, or <br />5 <br /> <br />
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