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Last modified
7/14/2009 5:02:28 PM
Creation date
5/22/2009 4:47:50 PM
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UCREFRP
UCREFRP Catalog Number
3010
Author
Holden, P. B. and D. A. Selby.
Title
Study to Determine the Spawning Requirements of Colorado Squawfish.
USFW Year
1978.
USFW - Doc Type
Logan, UT.
Copyright Material
NO
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<br />. <br /> <br />On May 13, the RF-40 receiver arrived. The RF-40 is designed to be manually <br />. tunable to anyone of the transmitter frequencies. It was used in conjunction <br />with a hand-held directional loop antenna. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />I <br /> <br />t <br /> <br />~ <br /> <br />MAY 14 - START OF PHASES I AND IV <br />With the arrival of the RF-40 receiver, Phase I was initiated. This phase <br />involved the testing of the radio equipment under field conditions. Initial <br />testing was conducted on the two implanted squawfish held in the live box. These <br />fish were in about two feet of water and signals were audible at 75-100 yards. <br />A difference in the strength of the two tags was noted, i.e., 40.612 was stronger <br />than 40.621.. <br />A tag was then placed in a longhandled dip net and moved about in the river <br />via a motor boat. The receiver was used from the bank. A signal was audible at <br />ranges of 100 yards in shallow (to 4 feet) water, and 40-50 yards in deeper (8- <br />10 feet) areas. This was a shorter range than we had anticipated, judging from <br />the manufacturer's claims. It was considered minimal, but adequate for the <br />tracking of radio tagged fish because, in most places, fish near either bank <br />could be located from the center of the river. <br />This was also the date of initiation of Phase IV. The two squawfish tagged <br />on May 10 were released the morning of May 14. Two more squawfish were implanted <br />with transmitters 40.652 and 40.662 that afternoon. Both appeared very healthy <br />that evening and were released. At this time, all four fish were in the back- <br />water where they had been released. They were slowly moving about the backwater <br />and showed no signs of congregating. <br /> <br />9 <br />
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