Axial muscle activity of trout exposed to unsteady flow
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1
University of Bonn, Germany
Rheophilic fish like trout are constantly exposed to running water and flow perturbations. Instead of preferring undisturbed flow regions, trout often hold station in regions with unstable flow. For instance, in a flow channel trout use the vortex street caused by a submerged D-shaped cylinder to save energy during a behavior called Kármán gaiting. Trout also prefer other regions relative to the cylinder called entraining- and bow wake region. We exposed trout for three hours to a submerged D-shaped cylinder to test their long time performance. Over the full time period muscle activity of red and white swimming muscles as function of three dimensional trout position inside the flow channel was acquired. As expected trout preferred the Kármán gait, entraining and bow wake zone. A fourth station holding zone was found which we called wave mode zone. In this work entraining, Kármán gait, wave mode and bow wake region were classified by their three-dimensional structure of probability of trout presence and muscle activity. Single trout in this study preferred in 63% of the cases one region during one experimental run. Inside entraining, Kármán gait, bow wake and wave mode region trout showed reduced muscle activity compared to the rest of the flow channel. Flow was measured with particle image velocimetry.
Acknowledgements
We want to thank Simon Kranz and Felix Kaldenbach who contributed to the experiments. This work was funded by the DFG (SPP 1207).
Keywords:
Bow wake,
Electromyography,
EMG,
Entraining,
Kármán,
Swimming,
Trout,
Wave mode
Conference:
Tenth International Congress of Neuroethology, College Park. Maryland USA, United States, 5 Aug - 10 Aug, 2012.
Presentation Type:
Poster Presentation (see alternatives below as well)
Topic:
Orientation and Navigation
Citation:
Bleckmann
H and
Klein
A
(2012). Axial muscle activity of trout exposed to unsteady flow.
Conference Abstract:
Tenth International Congress of Neuroethology.
doi: 10.3389/conf.fnbeh.2012.27.00268
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Received:
30 Apr 2012;
Published Online:
07 Jul 2012.
*
Correspondence:
Mr. Adrian Klein, University of Bonn, Bonn, Germany, adrian@uni-bonn.de