| Entraining in trout: a behavioural and hydrodynamic analysis. | |
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MedLine Citation:
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PMID: 20709926 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Rheophilic fish commonly experience unsteady flows and hydrodynamic perturbations. Instead of avoiding turbulent zones though, rheophilic fish often seek out these zones for station holding. A behaviour associated with station holding in running water is called entraining. We investigated the entraining behaviour of rainbow trout swimming in the wake of a D-shaped cylinder or sideways of a semi-infinite flat plate displaying a rounded leading edge. Entraining trout moved into specific positions close to and sideways of the submerged objects, where they often maintained their position without corrective body and/or fin motions. To identify the hydrodynamic mechanism of entraining, the flow characteristics around an artificial trout placed at the position preferred by entraining trout were analysed. Numerical simulations of the 3-D unsteady flow field were performed to obtain the unsteady pressure forces. Our results suggest that entraining trout minimise their energy expenditure during station holding by tilting their body into the mean flow direction at an angle, where the resulting lift force and wake suction force cancel out the drag. Small motions of the caudal and/or pectoral fins provide an efficient way to correct the angle, such that an equilibrium is even reached in case of unsteadiness imposed by the wake of an object. |
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Authors:
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Anja Przybilla; Sebastian Kunze; Alexander Rudert; Horst Bleckmann; Christoph Brücker |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Journal of experimental biology Volume: 213 ISSN: 1477-9145 ISO Abbreviation: J. Exp. Biol. Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-08-16 Completed Date: 2010-11-24 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0243705 Medline TA: J Exp Biol Country: England |
Other Details:
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Languages: eng Pagination: 2976-86 Citation Subset: IM |
Affiliation:
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Institute of Zoology, University of Bonn, Poppelsdorfer Schloss, 53115 Bonn, Germany. przyb@uni-bonn.de |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animal Fins
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physiology Animals Behavior, Animal / physiology* Biomechanics Computer Simulation Hydrodynamics* Models, Biological Oncorhynchus mykiss / physiology* Rheology Tail / physiology Time Factors |
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