7081

• UCREFRP Catalog Number: 7081
• Author: Chart, T. E.
• Title: Initial Effect of Impoundment on the Fish Community of the White River, Colorado.
• USFW Year: 1987.
• USFW - Doc Type: Colorado State University,
• Copyright Material: NO

to
Boat electrofishing was the only technique which proved effective
for sampling the adult riverine fishes. Passive gill net sets and
active gill net sweeps were attempted in 1984 but proved ineffective.
In 1984 and 1985, electrofishing was conducted with a 2500 watt
generator and a Coffelt VVP-15 mounted in a 14' jon boat powered by a
- 15 horsepower outboard. Electrofishing effibiency varied greatly with
-- river stage and conductivity. Following completion of each consecutive
0.8km section, all fish were measured, weighed and released.
Electrofishing effort (time pursuing fish, not including transitory
movement) was also recorded.
Electrofishing data were collected regularly from early July
through September, 1984 and between April and September, 1985.
Sampling was concentrated in the 8km above the reservoir basin, 8km
immediately below the dam axis, and in the four 0.8km Recovery stations
(R1-R4); the first located at Rangely, Colorado (RK I51.2) and the
remaining three at 8km intervals downstream.
A]1 tests for statistical significance were done using the Minitab
program and consisted primarily of analysis of variance and associated
F-tests unless otherwise stated.
In 1985, 1.6km of riverine habitat above the anticipated upper end
of Kenney Reservoir was inundated by the filing reservoir. For this
reason, the upstream study area was reduced from B.Okm to 6.4km
following impoundment. Due to the similarity of fish collections
from the recovery stations, data from these four sections were combined
and referred to collectively.