8091

• UCREFRP Catalog Number: 8091
• Author: Miller, W. H., et al.
• Title: White River Fishes Study
• USFW Year: 1982.
• USFW - Doc Type: Final Report.
• Copyright Material: NO

Sampling was not only stratified spatially, but also temporally.
Seasonal sampling conformed to the river stages of prerunoff, runoff,
and post-runoff (Table 1). Days were also stratified into three sampling
periods (Figure 4). Daylight activities included setting nets and
traps, making physical and chemical measurements, and electrofishing.
During darkness nets and traps were tended and electrofishing and some
seining were performed. The standardized sampling schedules and proce-
dures were strictly adhered to except when weather conditions, manpower
shortages and equipment failure dictated minor changes in the schedules
and sampling procedures.
Sample sites were precisely located on topographic maps. Sketches
were made of each 0.5 mi (0.8 km) station (Figure 5) illustrating the
prevalence and juxtaposition of habitat categories (Table 2).
Three cross-sectional depth profiles were recorded at each 0.5 mi
(0.8 km) intensive section using an electronic depth recorder. Depth
profiles were recorded at each end of the 0.5 mi (0.8 km) sample sections
and at the mid-point of the section. Water quality measurements were
taken at each intensive sample site. These included dissolved oxygen
(DO), turbidity, air and water temperatures, salinity and conductivity.
Such variable parameters as temperature and DO were taken between 1000
and 1400 h.
An effort was made to collect fish from every habitat present in a
sample station (Table 2). The habitat where each fish was collected was
described from a series of depth, velocity, and substrate measurements.
Bottom substrates were classified according to the following:
Silt fine gritty material
Sand less than 3 mm diameter
Gravel 3 mm to 76 mm
Rubble 76 mm to 305 mm
Boulder 305 m m and larger
Bedrock rock outcropping
The 4.5 mi (7.2 km) reach between stations was sampled in a more
general manner, primarily by electrofishing, in order to provide a
survey of adult fishes. Physical data were collected only at sites of
rare fish captures.
Each habitat present in the stations was sampled with every effec-
tive gear type. Rare fish captures were located on river maps to the
nearest 0.1 mi (0.16 km) and water depth, velocity measurements and the
predominent substrate type recorded. All fish collections were accom-
panied with detailed information regarding location, date, time of day,
measure of effort, habitat type, substrate type and a series of depth
and velocity measurements.
7.