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Last modified
7/14/2009 5:02:33 PM
Creation date
6/1/2009 11:59:42 AM
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UCREFRP
UCREFRP Catalog Number
8216
Author
Crowl, T. A. and L. Lentsch.
Title
Estimating Northern Pike Predation on Colorado Squawfish in the Middle Green River
USFW Year
1996.
USFW - Doc Type
A Bioenergetics Approach.
Copyright Material
NO
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i <br />r <br />t <br />(within 5-15 % of field-generated estimates) for largemouth bass (Rice and Cochran 1984) and <br />salmonids {Beauchamp et al. 1989, Brodeur et al. 1992, Ruggerone and Rogers 1992). <br />Water temperature regimes and energy expenditure associated with movement of individual <br />fish were obtained by radio-telemetry. During May and June 1993, pike greater than 350 mm <br />were captured, anesthesized with MS-222 and surgically implanted with internal radio <br />transmitters (30 and 40 MHz). Transmitters were placed into the body cavity through 30-35 <br />mm incisions that were then closed with catgut sutures. Pike were released within one hr of <br />implantation. Twenty-nine pike from the Ouray section of the Green River were implanted <br />with radio tags and monitored for daily or monthly movement. Movements were recorded at <br />least monthly from the time of release through June 1994 for all months except January 1994. <br />Pike were located by triangulation and recorded by river mile. At least 5 pike were followed <br />continuously over a 24 h period on four separate occasions to determine diet movement patterns. <br />Water temperature data were taken at fish positions whenever radio-tagged pike were located. <br />Temperatures were occasionally recorded over a diet sequence, and at least one temperature was <br />recorded at a fish position per month during May-November 1993. These temperatures compared <br />favorably to daily main channel temperatures measured at the Ouray National Wildlife Refuge <br />(U.S. Fish and Wildlife Service, unpublished data). Temperature records were entered into the <br />model, and missing daily values were interpolated by the model using a sine function. <br />5 <br />
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