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Last modified
7/14/2009 5:02:34 PM
Creation date
5/24/2009 7:13:43 AM
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UCREFRP
UCREFRP Catalog Number
8278
Author
Cavalli, P. A.
Title
An Evaluation of the Effects of Tusher Wash Diversion Dam on movement and Survival of Juvenile and Subadult Native Fish.
USFW Year
2000.
USFW - Doc Type
Salt Lake City.
Copyright Material
NO
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Subadult Fish Passage at Tusher Wash Diversion Dam <br />Subadult Tagging <br />A 16-foot long rubber raft, rigged with electrofishing gear, was used to sample fish in the <br />Green River from Swasey's Rapid (river mile [rm] 132) to the Green River State Park boat ramp <br />(rm 120). Most of the effort was expended between rm 132 and rm 125. Electricity was <br />produced with agasoline-powered generator and output current was controlled with a Coffelt <br />VVP-15 electrofishing unit. Output voltage was kept near six amperes. One spherical cathode <br />was used with one anode consisting of cable droppers. One person rowed the raft and controlled <br />the electrofishing gear while one or two people netted fish. Nearly all of the sampling was <br />conducted along shorelines and in shallow areas near islands. All fish captured were kept in a <br />live well until they were measured to the nearest millimeter and weighed to the nearest gram, <br />unless large numbers of fish were captured. In this situation, all native fish and a representative <br />sample ofnon-native fish were weighed and measured. The remaining fish were only <br />enumerated. Thirty-one Colorado pikeminnow and five Gila spp. were tagged with a Passive <br />Integrated Transponder (PIT tag) injected into the body cavity. Two-hundred thirty-one <br />flannelmouth suckers (C. latipinnis) and 182 bluehead suckers (C. discobolus) were tagged <br />below the dorsal fin with individually numbered T-bar Anchor tags (FLOY TAG and <br />Manufacturing, Inc.). Three-hundred thirty-four channel catfish, 35 common carp (Cyprinus <br />carpio) and 1 black bullhead (Ameiurus melas) were tagged below the dorsal fin with T-bar <br />Anchor tags that were not individually numbered. All tagged fish were released downstream of <br />Tusher Wash Diversion Dam. <br />Subadult Telemetry <br />Radio transmitters were used to collect movement data on native fish. Transmitters <br />produced by Advanced Telemetry Systems were implanted in seven Subadult Colorado <br />pikeminnow, nine Subadult flannelmouth suckers, and five subadult bluehead suckers. <br />Transmitters ranged in weight from 2.04 g to 7.59 g (life expectancy from 30 to 85 days) and <br />were never implanted in a fish unless the weight of the transmitter was less than two percent of <br />the weight of the fish. This protocol was followed in an effort to minimize the loss of <br />transmitters (as recommended in Marty and Summerfelt (1986)) and behavioral changes. All <br />transmitters were equipped with an external antenna; however, the antenna was coiled and placed <br />within the body cavity on five of the Colorado pikeminnow, since this configuration has been <br />shown to work well in this species (Tim Modde, U.S. Fish and Wildlife Service, personal <br />communication). <br />Fish that were to be implanted with a radio transmitter were first anesthetized with <br />tricaine methane sulfonate (Finquel brand of MS-222). Transmitters implanted in Colorado <br />pikeminnow were inserted in an incision made along the side of the fish in a position that was <br />anterior to the left pelvic fin. This location was used so that the transmitter would not rest upon <br />the incision. Transmitters implanted in flannelmouth suckers and bluehead suckers were inserted <br />in an incision along the midline of the ventral portion of the body. This location was selected <br />because lateral incisions in suckers (especially in bluehead suckers) tend to bleed copiously <br />(personal observation). A curved needle was used to make a small hole behind the incision used <br />to implant the transmitter (except in the case of five Colorado pikeminnow, as described above). <br />The antenna exited the body cavity through this opening. Fresh water was administered to the <br />gills of the fish during the surgery. Alcohol was used as a disinfecting agent, and saline solution ~ <br />4 <br />
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