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Four adult Gila spp. (elegans or cypha) from Grays Canyon were captured, <br />to the Willow Beach hatchery and three later died. Two of these <br />were sent to Fort Morgan for disease analysis. Psuedomonas fluorescens, <br />a bacteria; Sa role nia sp., a fungus; Myxobolus sp., Myxidium sp., <br />protozoan parasites, and Lerneae cyprinacea, a crustacian parasite called <br />anchorworm, were found in these fish. Death was due to stress-mediated <br />infections caused by handling and injury. The single survivor is now <br />in good condition at Willow Beach. <br />One Mohave bonytail chub died after spawning in 1980• Saprolegnia sp. <br />and a gill amoeba were detected but the cause of death was undetermined. <br />Razorback Sucker <br />Distribution and Abundance <br />Razorback suckers were rarely caught in the main river reaches <br />during systematic sampling progtrams Four seasons of sampling has <br />resulted in five adult razorback suckers being collected in the Grp <br />River, all in the moderate.reach of river in the Uinta Basin. <br />No razorbacks have been recovered during the standardized sampling <br />program from the Colorado or Gunnison Rivers. Adult specimens were captured <br />consistently from two abandoned gravel pits that were connected to the river, <br />near nd Junction. They were especially prevalent during spring runoff. <br />These appeared to be primarily spawning concentrations though progeny <br />have never been collected from these areas. Extensive electro- <br />fishing and other collecting activities associated with radio tracking work, <br />in the Ouray area of the Green River resulted in captures of 15 adult <br />razorback suckers, one of which was implanted with a radio transmitter and <br />tracked for several months. <br />39