7256 - Laserfiche WebLink

Home Browse Search

. the river. Two 0.5-in (1.3-cm) diameter rebar were anchored into the river substrate to hold and position each drift net in the current. The depth each net fished was adjusted so combined they sampled the entire water column. Samples collected during each 1 hr period were placed in Whirl Pak bags and preserved with 10 percent formalin. Larval fish were later sorted from sample debris and placed in 5 percent formalin. Hand seines were fished in backwaters of the White River during August to qualitatively sample larval fish. Larval fish were preserved in 5 percent formalin. Samples collected by drift netting and hand seining were delivered to the Larval Fish Laboratory, Colorado State University, Fort Collins, Colorado, for identification. Young-of-the-year fish were collected in October by seining backwater areas at 5 mi intervals from the Utah-Colorado state line to the confluence of the White with the Green River. Fish were large enough at this time to be identified by project personnel. Physical habitat data (i.e., depth, velocity, and substrate information) were collected in 1982 near RM 35 of the White River by FWS personnel. Five transects were established at the site, from which three data sets were obtained. Physical habitat data were taken at a high, medium, and low flow on the descending limb of the hydrograph. Field data were analyzed by FWS personnel using a physical habitat simulation (PHABSIM) computer model (IFG-4) (Bovee and Milhous 1978; Milhous et ale 1981; and Bovee 1982). Habitat suitability curves used for spawning squawfish in this analysis were those reported by Prewitt et ale (1982) in Miller et ale (1982a). . . . . . . . . . 9 .