9554

• 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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RESULTS

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Sampling

2001

Electrofishing for northern pike removal began on 19 March 2001, ended on 08 May, and

lasted 34 sampling days (Table 1). Crews fished for a total of 19.1 hours for this project (Table

2). The fyke netting effort began on 20 March and was completed on 01 June. This effort

consisted of 421 fyke net nights. Crews also spent 37.7 hours electrofishing with a trammel net

using the "block and shock" method where an area is closed offusing a trammel net and fish are

then chased into the trammel net as they try to escape the electrofishing equipment. This effort

began on 20 March and ended on 29 June. Between the three efforts, 222 northern pike were

removed from the Green River (Table 2). Crews also electrofished the middle Green River for

the Colorado pikeminnow abundance estimates this year. This effort took 253 hours and

removed an additional 29 pike from the reach for a grand total of 251 (Table 3). Mean total

length of all pike captured was 613 mm (170 mm - 871 mm) (Table 1; Figure 2). Northern pike

were predominantly removed between middle Green River RM 303 (Thunder Ranch) and RM

294 (Walker Hollow), though crews removed a few pike from the Split Mountain reach and

around the town of Ouray and the Duchesne River (Table 4).

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2002

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Electrofishing for northern pike began on 02 April 2002, ended on 10 June, and took 20

sampling days to complete (Table 1). Crews fished for a total of 28.1 hours for this project

(Table 2). Fyke netting began on 10 April and ended on 23 May. This effort consisted of 165

fyke net nights. Crews also spent 5.3 hours trammel netting between 16 April and 10 June.

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