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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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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 />but the remaining fish seemed evenly distributed from age-two to age-seven. Finally, in 2005, <br /> <br />fish were relatively evenly spread between age-one and age seven. <br /> <br />As explained earlier, fish were lumped into YOY, juvenile, and adult fish due to a great <br /> <br />deal of overlap in the age-at-length estimates. Over the course of the study, only three young-of- <br /> <br />year (YOY) fish were captured; this was in 2001 and 2002. These fish were 170,295, and 390 <br /> <br />rom. The 390 mm fish was captured early in 2000 and was likely an age-l fish with no distinct <br /> <br />c1eithra markings. In 2002 and 2003, most fish were adult fish and ranged from 520 to 984 mm. <br /> <br />In 2004, this shifted to most fish being predominantly juvenile fish, ranging in length from 371 <br /> <br />to 480 mm. In 2005, pike numbers were low and juvenile/adult fish were evenly represented in <br /> <br />the catch (Figure 8). Length ranges for all aged fish from 2001 to 2005 are included in Table 6. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Stomach Content Analysis <br /> <br /> <br />Over the course of the study, most extracted stomachs were empty. Only 13 of 144 fish <br /> <br /> <br />had stomach contents recorded. Of these 13, five had minnows, shiners, and sunfish listed as <br /> <br /> <br />their stomach contents. Four additional northern pike had potentially larger prey items in the <br /> <br /> <br />stomachs (though prey size was rarely recorded for nonnative fish): channel catfish, black <br /> <br /> <br />bullhead, white sucker, and one 178 mm smallmouth bass (this pike was 620 mm total length). <br /> <br /> <br />Four northern pike had consumed native fish: three of which were hatchery reared razorback <br /> <br />suckers (recently stocked in the Green River); the fourth native fish was a bluehead sucker. All <br /> <br />native fish were near 250 mm in size and were eaten by northern pike ranging from 597 mm to <br />834 nun. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />21 <br />
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