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5 <br />It was the purpose of this study to determine the abundance and distri- <br />bution of endemic fish in the White River in Utah during spring runoff, when <br />adult fish might ascend the river to spawn, and following runoff, when larval <br />fish might be present. <br />MATERIALS AND METHODS <br />The White River in Utah flows 66 mi (106 km) from the Colorado border <br />to its confluence with the Green River. The upper 42 mi (67 km) which <br />flows through both public and private land was surveyed in both 1978 (Lanigan <br />et al., 1979; Lanigan and Berry, 1979) and in 1979. The lower portion flows <br />through the UOIR where a fishery survey was conducted in 1978 by the <br />USFWS's Vernal Fisheries Assistance Office. Information from the latter <br />survey is included in this report. Consequently, data on the entire length <br />of the White River in Utah is presented instead of only the upper portion <br />as contracted. <br />Sampling Methods <br />The river on the Reservation was surveyed in 1978 on July 8-11, just <br />after the river began to receed from the peak of spring runoff, and again <br />on September 26-28. Sampling was conducted over the entire 24 mi (39 km) of <br />the river using an electrofishing boat equipped with a 3-phase high cycle, <br />240 v, AC generator. <br />The upper 42 mi (67 km) of the river on BLM and private land was <br />surveyed on July 21-25, July 30-August 2, August 21-24, and September 11-14 <br />during 1978 and on April 30-May 3, May 29-31 and June 11-14 in 1979. Various <br />types of sampling gear and techniques were tried during the first few <br />sampling trips in 1978. Trammel nets were floated through pools; frame <br />nets were set overnight in backwater areas; experimental gill nets were set <br />for short time periods in pools, seine hauls were made with various types <br />of seines; electrofishing was conducted; and a combination of electrofishing