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Last modified
8/11/2009 11:32:58 AM
Creation date
8/10/2009 5:05:02 PM
Metadata
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Template:
UCREFRP
UCREFRP Catalog Number
9554
Author
Monroe, L. and T. Hedrick.
Title
Northern Pike (Esox lucius) Control in the Middle Green River, Utah 2001-2006.
USFW Year
2008.
USFW - Doc Type
109,
Copyright Material
NO
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<br />. <br /> <br />. <br /> <br />Electrofishing for northern pike began on 11 May 2006, ended on 12 May, and only <br /> <br /> <br />lasted one sampling day (most electrofishing effort in 2006 was done during other projects) <br /> <br /> <br />(Table 1). Crews fished for a total of 3.3 hours for this project (Table 2). Fyke netting began on <br /> <br /> <br />27 March and was completed on 31 May. This effort consisted of 52 fyke net nights. Crews <br /> <br /> <br />continued to trammel net for northern pike between 27 March and 30 March and spent a total of <br /> <br /> <br />two hours on this activity in 2006. Between the three efforts, a total of three northern pike were <br /> <br /> <br />removed (Table 2). Crews returned to the Colorado pikeminnow abundance estimates (190.4 <br /> <br /> <br />hours) and continued smallmouth bass removal (152.2 hours) and removed an additional 17 <br /> <br />northern pike during these projects (Table 3). Mean total length of all pike removed was 549 mm <br />(365 mm - 790 mm) (Table I; Figure 4). Most pike were removed from the Split Mountain reach <br />in 2006 (Table 4). <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Catch Per Unit Effort <br />A total of 414 northern pike was removed over the six years of this removal effort. Total <br /> <br />catch per effort over the six removal years by gear type was as follows: 0.60 fish/hour <br /> <br /> <br />electrofishing, 0.16 fish/fyke-net night using fyke nets, and 0.76 fish/hour trammel netting and <br /> <br /> <br />electrofishing. In general, following the removal of 251 northern pike and the highest catch rates <br /> <br /> <br />in 2001, both numbers of pike removed and catch-per-effort have gradually declined and <br /> <br /> <br />remained low through 2006 (Table 1; Figures 5 and 6). <br /> <br /> <br />This is also true for northern pike captured during other studies. Catch rates of pike <br /> <br /> <br />during the Colorado pikeminnow abundance estimates (2001-2003; 2006) and smallmouth bass <br /> <br /> <br />removal (2004-2006) started low (0.11 pike/hour and 0.06 pike/hour for each project <br /> <br /> <br />respectively) and have remained low (0.08 pike/hour and 0.02 pike/hour in 2006 for each project <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />19 <br />
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