Brown Trout (Salmo trutta) in the Kananaskis
C.M., S.J. Cooke and R.S. McKinley. 1999. Movement and
summer habitat of brown trout (Salmo trutta) below
a pulsed-discharge hydroelectric generating station.
Regulated Rivers. 15: 395-403.
Abstract - We used radio-telemetry to
investigate detailed movement and summer habitat of brown
trout Salmo trutta (size range 157 - 488 mm TL, n =
18) in the Kananaskis River, Alberta. Flows in the
Kananaskis River respond to pulsed daily discharge from an
upstream hydroelectric generating facility (range 0.15 -
25 m3.s-1). Wetted area available
for brown trout doubled during periods of high flow.
Fluctuating river levels did not appear to influence the
degree to which brown trout moved within the study site.
However, there was evidence that brown trout used cover
and pools more as discharge increased. During high flow
conditions, brown trout used similar depths (63 cm), and
significantly lower surface water velocities than during
low flow conditions. Brown trout also moved closer to
shore into interstitial spaces among woody debris and root
complexes during high flow. Pool habitats were used most
often compared to all other habitat types combined. Pools
with large woody debris accounted for 75 % of all habitat
observations. Woody debris was used more often than all
other cover types. Results of the study indicate that the
effects of river regulation on brown trout appear to have
been moderated by woody debris in pools and along river
banks, that provided refuge from high water velocities
during periods of high flow.