7770

• UCREFRP Catalog Number: 7770
• Author: Trammell, M. A.
• Title: Evaluation of Colorado Squawfish Stocking in Kenney Reservoir, Rangely, Colorado.
• USFW Year: 1991.
• USFW - Doc Type: Colorado State University,
• Copyright Material: NO

12
The radio transmitters were ATS modules with loop antennae, powered
' by 6-month mercury batteries, and operating in the 40.320 to 40.680 MHz
' range. These tags were monitored with an ATS programmable digital radio
search receiver, using a whip antenna and a directional loop antenna. The
' sonic transmitters were Sonotronic tags with 14 month batteries, three of
which counted out their numerical designations, and four of which pulse
' Th
ey were
rates had to be timed, ranging from 40 to 90 beats-per-minute.
' monitored with a Sonotronics Model DH-2 hydrophone and USR-5B digital
receiver system.
Results
Distribution in Kenney Reservoir
' act
in com
wa
fi
h
th
h
i
p
y
swam a
s
e squaw
e reservo
r,
When released into t
' schools that were soon lost to sight in the turbid water. They dispersed
quickly throughout the reservoir. Specimens were collected across the
' reservoir from the stocking site, near the spillway in three days, and
were found at many sites along the shoreline on both sides of the
reservoir, up- and downstream of the stock sites, within one week. As
' long as any squawfish were collected, recapture sites remained well
distributed along the shoreline.
The squawfish swam in homogenous schools with other small fish.
Large schools of small fish observed and then seined were found to be

composed of as many as seven species (e.g., Colorado squawfish, roundtail
chubs, flannelmouth suckers, fathead minnows, red shiners, carp, black
crappie). There were no microhabitat separations between species apparent
in casual observations, except for black crappie, which held themselves
separate from other species in shaded areas under the docks.