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North Platte River Fish Survey Casper to the Nebraska State Line
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North Platte River Fish Survey Casper to the Nebraska State Line
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Last modified
2/15/2017 1:56:32 PM
Creation date
2/25/2013 11:12:21 AM
Metadata
Fields
Template:
Water Supply Protection
Description
related to Platte River Endangered Species Partnership (aka Platte River Recovery Implementation Program or PRRIP)
State
WY
CO
Basin
North Platte
Date
3/1/2000
Author
Susan Broderick U.S. Bureau of Reclamation Technical Service Center Denver, CO
Title
North Platte River Fish Survey Casper to the Nebraska State Line
Water Supply Pro - Doc Type
Report/Study
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North Platte River Fish Survey - March 1999 Page 3 <br />Guernsey Reservoir; Guernsey Dam outlet to the Laramie River confluence; and the Laramie <br />River confluence to the Nebraska State line. <br />METHODS <br />Boat - mounted electrofishing was conducted in reaches of the North Platte River with adequate <br />flows using a 4.9 -m raft equipped with a Honda EX 1000 generator and a Model 1.5 -kVA <br />Smith -Root electrofisher delivering pulsed DC current. The crew consisted of an oarsman and <br />two netters. Raft sampling was conducted in the following reaches: Casper to Douglas, Douglas <br />to Glendo inlet, and the Laramie River confluence to the State line. Total minutes of <br />electrofishing ranged from a minimum of2,000 seconds up to 11,694 seconds for longer sections <br />of river for a total of nine boat - mounted samples. Habitat in areas of large woody debris, rock <br />riprap, and boulders were intensively sampled and were very productive for fish. Shallow edge <br />areas were also sampled extensively for juveniles and smaller fish species. We also sampled some <br />mid- channel habitat. A single pass was made. <br />Backpack electrofishing with a Smith -Root Model 12 -b 400 -watt battery- powered electrofisher <br />was conducted in the low flow reaches of Glendo outlet to Guernsey inlet (approximately 10 cfs), <br />and Guernsey outlet to the confluence with the Laramie River (also approximately 10 cfs). Flows <br />were so low that boat- mounted electrofishing was not possible. Sample area ranged from a <br />minimum of 150 m to a maximum of 300 m in length with the width spanning across the entire <br />river channel. We also backpack - sampled shallow communities along the edges of the river in <br />the two high flow reaches from Casper to Douglas and Douglas to Glendo inlet. Sample area <br />covered generally was 300•m long by 2.5 to 3 m wide. The river channel in these reaches became <br />too deep to sample effectively much beyond a 3 -m -wide strip along the river's edge. The crew <br />consisted of an operator and two netters. A total of 11 sites were sampled with a minimum of <br />978 seconds electrofishing conducted at two small sites ranging up to 5,776 seconds at wide <br />channel sites. <br />Captured fish were placed in a live car and processed frequently. Total lengths; weights; and <br />observations on disease, deformities, injuries, and general condition were recorded. Some ofthe <br />most numerous species, such as common carp (Cyprinus carpio) and longnose dace (Rhinichthys <br />cataractae) were tallied after several complete samples were measured. Processed fish were <br />released unharmed on the opposite side of the river in the case of boat - mounted sampling and <br />upstream ofthe sampling area in the case of backpack sampling to prevent recapturing the same <br />individuals. Notes on the habitat were made at each site and appear in the data sheets in the <br />appendix. Species that could not be positively identified in the field, particularly cyprinids, were <br />preserved for later identification in the lab using a dissecting scope. <br />Habitat characteristics for each sample area were estimated by percent cover for the entire reach <br />sampled. Substrate classification by particle size followed that described in Armour and Platts <br />(1983) and is summarized below. <br />Methods <br />
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