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During the course of this survey, we collected four Colorado <br />squawfish, two adults and two YOY. The first specimen, 540 mm <br />TL, 445 mm SL, 1.1 kg, was collected on 7 May 1987 at River Mile <br />151.5. It was tagged with a green Carlin tag (NMFG 1514) and <br />released. The fish was collected in a 5 x 25 m still water area <br />formed on the downstream end of an island near the junction of <br />the main and a secondary channel. Water depth was about 2 m. <br />The second individual, also captured during the May trip (8 <br />May 1987) was stunned at River Mile 140.1 by the shocking boat <br />but eluded capture. It was later captured by the shocking raft <br />at River Mile 139.0. The specimen, a female, was 780 mm TL, 645 <br />mm SL, and weighed over 5.5 kg. It was also tagged with a green <br />Carlin tag (NMFG 1821) and released. This fish was first <br />encountered in the main channel of the San Juan River about 300 m <br />above its confluence with the Mancos River. Water velocity was <br />swift (1.0-1.5 m/sec), depth was.greater than 2 m, and the river <br />scoured against a large, rocky cliff-face. <br />On 10 August 1987 a large (ca. 700 mm TL) Colorado <br />squawfish, easily identifiable by its huge head, thick lips, and <br />deeply forked tail, was stunned at River Mile 150.4 but avoided <br />capture. The fish was not only seen and identified by the <br />netter, but also by two people on the support raft, less than 2 m <br />away. Included in this group was Sharon Tully (USER, Salt Lake <br />City, Utah) who has considerable experience with fish collection <br />and identification in the Upper Colorado River Basin. The river <br />level during the August trip was only 25% of the May trip, but at <br />this location the water was deep and fast at the base of a rock- - <br />36