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2. In addition to the quantitative collections outlined <br />above, qualitative samples were also taken using a <br />larval dip net. Investigators actively searched out <br />larvae in any habitat at the site of the seine collec- <br />tions and collected a sample of these larvae with a <br />dip net. <br />3. The investigators then proceeded to the beginning of <br />the next 5 mi (8 km) section and repeated the pro- <br />cess. <br />Samples were collected from three habitats: backwaters, eddies and <br />shorelines. The number of samples collected per 5 mi (8 km) section is <br />given below: <br />1. Backwater (4 collections) <br />a. deep (2) <br />b. shallow (2) <br />2. Eddy (4 collections) <br />a. deep (2) <br />b. shallow (2) <br />3. Shoreline (6 collections) <br />a. vegetation (2) <br />b. gravel/cobble (2) <br />c. sand/silt (2) <br />Larval collections were made in late July, 1981. Beginning in <br />September, YOY collections for the larger Colorado squawfish were made <br />using the same sampling design, with the exception that fishes were <br />identified in the field and a one-quarter inch mesh seine was used for <br />all collections. <br />Radiotelemetry of Colorado squawfish <br />Extensive sampling was conducted in the Yampa and Green rivers in <br />April and May, 1981, to obtain Colorado squawfish for use in radio- <br />telemetry studies. It is emphasized that these collections were biased. <br />in favor of obtaining Colorado squawfish from habitats where they were <br />most, abundant. Although cold weather made it difficult to collect fish, <br />the collections began early so the fish might recover from the surgery <br />before the spawning season. <br />Colorado squawfish were captured by electrofishing. Fish were <br />anesthetized with MS 222 and surgically implanted with radiotransmitters <br />immediately after capture. Surgical procedure was similar to Bidgood <br />(1980) except for several departures; sutures were tied off individually <br />(usually five) rather than in the continuous stitch suture used by <br />Bidgood and the incision was made laterally, immediately anterior and <br />slightly dorsal to the insertion of the right pelvic fin. <br />14