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I I Ji I ., I I I . I: I I ,I I I; I I I I I Telemetry of humpback and roundtail chub Humpback and roundtail chub were surgically implanted with radio transmitters to determine their movements within the Little Snake River and between the Little Snake and Yampa rivers. Anesthesia and surgical techniques followed procedures of Summerfelt and Smith (1990). Transmitters were 40 MHz, weighed 2.0 g, had a thin, wire antenna, and a life expectancy of 90 days. Fish were sedated and anesthetized for surgery with a treatment bath of river water mixed with a stock solution of tricaine (200 mg/L). The dilute, acidic solution was buffered with 200 to 250 mg sodium bicarbonate (NaHC02) per 100-mg tricaine to maintain blood pH and reduce respiratory stress (Summerfelt and Smith 1990). Surgical tools and transmitter were disinfected with benzalkonium chloride (Zepharin chloride, diluted 1: 128) and rinsed in sterile saline solution prior to implantation. Anesthesia was maintained during surgery with a dilute, buffered tricaine solution 11 mg/L) in river water flushed over the gills. A 3-cm incision was made along the ventral surface, anterior to the pelvic girdle and slightly lateral to the midline. The transmitter and antenna were inserted into the body cavity and the wire antenna looped along the posterior margin of the body cavity. Suture material was 90-day absorbable monofilament. Post-surgical recovery occurred in fresh water with a 5 to 10 mg/L solution of stockman's salt (NaCI) to restore osmotic balance. Fish were held until they regained orientation and muscular control and then they were released at site of capture. We searched for telemetered fish every other week by boat or from shore in June and July and by fixed-wing aircraft in August and September. Each search started at the last known fish location. Once a fish was contacted from shore, its 7