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Turbulent flow reduces oxygen consumption in the labriform swimming shiner perch, Cymatogaster aggregata

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van_der_Hoop_2018_Turbulent_flow_JEB_AAM.pdf (2.246Mb)
Date
12/06/2018
Author
van der Hoop, Julie M.
Byron, Margaret L.
Ozolina, Karlina
Miller, David L.
Johansen, Jacob L.
Domenici, Paolo
Steffensen, John F.
Keywords
Vortex
Eddy
Gait
Swimming kinematics
Metabolism
Space use
QA Mathematics
QH301 Biology
SH Aquaculture. Fisheries. Angling
NDAS
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Abstract
Fish swimming energetics are often measured in laboratory environments which attempt to minimize turbulence, though turbulent flows are common in the natural environment. To test whether the swimming energetics and kinematics of shiner perch Cymatogaster aggregata (a labriform swimmer) were affected by turbulence, two flow conditions were constructed in a swim-tunnel respirometer. A low-turbulence flow was created using a common swim-tunnel respirometry setup with a flow straightener and fine-mesh grid to minimize velocity fluctuations. A high-turbulence flow condition was created by allowing large velocity fluctuations to persist without a flow straightener or fine grid. The two conditions were tested with Particle Image Velocimetry to confirm significantly different turbulence properties throughout a range of mean flow speeds. Oxygen consumption rates of the swimming fish increased with swimming speeds and pectoral fin beat frequencies in both flow conditions. Higher turbulence also caused a greater positional variability in swimming individuals (vs. low-turbulence flow) at medium and high speeds. Surprisingly, fish used less oxygen in high turbulence compared to low-turbulence flow at medium and high swimming speeds. Simultaneous measurements of swimming kinematics indicated that these reductions in oxygen consumption could not be explained by specific known flow-adaptive behaviours such as Kármán-gaiting or entraining. Therefore, fish in high-turbulence flow may take advantage of the high variability in turbulent energy through time. These results suggest that swimming behavior and energetics measured in the lab in straightened flow, typical of standard swimming respirometers, might differ from that of more turbulent, semi-natural flow conditions.
Citation
van der Hoop , J M , Byron , M L , Ozolina , K , Miller , D L , Johansen , J L , Domenici , P & Steffensen , J F 2018 , ' Turbulent flow reduces oxygen consumption in the labriform swimming shiner perch, Cymatogaster aggregata ' , Journal of Experimental Biology , vol. 221 , no. 11 , 168773 . https://doi.org/10.1242/jeb.168773
Publication
Journal of Experimental Biology
Status
Peer reviewed
DOI
https://doi.org/10.1242/jeb.168773
ISSN
0022-0949
Type
Journal article
Rights
© 2018, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1242/jeb.168773
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/17424

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