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<br />Implementation Program (USFWS 1978) for endangered fishes in the <br />Upper Colorado River Basin. The electrofishing crew consisted of <br />one boat operator and two dipnetters. During sampling, the <br />electrofishing boat proceeded down one shoreline of the river at a <br />constant rate. Fish were captured with long-handled dipnets and <br />target species placed in live tanks in the boat. All fish that <br />could be positively identified by the dipnetters were recorded. <br />Only rare fishes were targeted for capture although all fish that <br />could not be readily identified were netted for positive ID. Non- <br />native predatory fish were also captured and data recorded on <br />lengths and weights. - <br />All shoreline habitat within each stratum was sampled, where <br />possible, including backwaters, tributary mouths and other <br />shoreline features. Upon capture of a rare fish, electrofishing <br />was discontinued and-data collected. The fish was then PIT tagged <br />and returned to the water at the point of capture . Observations of <br />other native and non-native fish species were .recorded by <br />approximately 5-mile sections within strata B and C and by 1-mile <br />sections in stratum A. <br />Summer Electrofishina <br />A 1/4 mi]_e section was identified and intensively surveyed in <br />strata A (Rid 2.25-2.50) and B (RM 6.25-6.50) using a dep.;.etion <br />shocking methodology developed by Robson et.al. (1971). Two <br />8 <br />