|
Fish
Behaviour and Swimming in Turbulent Flows
We have
installed and operated cameras that stream fish movement
inside fishways, onto the internet since 2007. In 1997, 1998
and 1999, we used underwater videography to monitor fish
behaviour in several Denil and vertical-slot fishways. Miniature digital
CCD cameras were placed at fishway entrances, exits and
near areas that were identified as potentially problematic
within primary fishway flows.
We have learned much about
the behavioural effects of turbulence on fish passage
using these techniques. Since 1999 we have used
underwater videography to monitor fish spawning behaviour, fish passage and debris
deflection at several fishways in Ontario, as well as
overwintering congregations of fish under the ice in
rivers and lakes. Check out the following video clip that
shows a smallmouth bass (approx. 300 mm TL) negotiating
turbulent flows in a Denil fishway on the Grand River,
Ontario, Canada. Notice how fish appear to surf in
von Kármán vortex streets, rather than using constant
prolonged swimming to maintain positions in turbulent
flows.
Download high-resolution file
(6.0 MB) here
Smallmouth Bass in 20 % slope Denil fishway
Extended Length Video
This
Extended Length Video video shows smallmouth
bass, black redhorse, northern hog suckers and several other
species successfully swimming through a 10 % slope Denil fishway in the Grand River, Ontario, Canada. Each fish exits the
fishway from the bottom of the channel and proceeds downward towards
the bottom of the head-pond upstream from the Mannheim Weir.
Multiple species,
including smallmouth bass, shiners, bullhead, suckers and redhorse
in a 10% slope Denill fishway
in the Grand River, Ontario, Canada.
Extended Length
Video- multiple species
|
