New Zealand Journal of Marine and Freshwater Research abstracts
Fish swimming speed variability at constant flow: Galaxias maculatus
David R. Plew1
Vladimir I. Nikora2
Scott T. Larned1
Julian R. E. Sykes1
Glenn G. Cooper1
1 National Institute of Water and Atmospheric Research Limited
P.O. Box 8602
Christchurch, New Zealand
2 Department of Engineering
University of Aberdeen
Scotland, United Kingdom
Abstract Digital videography was used to study the swimming performance
of the adult fish Galaxias maculatus in a flume at fixed flows. Instantaneous
fish swimming velocities varied about the mean flume velocity and these variations
in swimming speed were found to increase as velocity in the flume increased.
Standard deviations in swimming velocity measured in the longitudinal direction
increased from SD 0.183 m s–1 at U0 = 0.40 m s–1, SD 0.191 at U0 = 0.48 m s–1 to SD 0.237 m s–1 at U0 = 0.60 m s–1 . Increases
in standard deviations were also seen in cross-stream and vertical swimming
velocities. Similarly, variability in acceleration increased as flume velocity
was increased with SD 1.850 m s–2 at U0 = 0.40 m s–1 , SD 2.492
m s–2 at U0 = 0.48 m s–1 , and SD 3.125 m s–2 at U0 = 0.60 m s–1 recorded
for the longitudinal acceleration component. Maximum swimming velocities of
2.05 m s–1 and accelerations of 25.4 m s–2 were recorded.
Keywords swimming performance; swimming velocity; fish acceleration;
inanga
New Zealand Journal of Marine and Freshwater Research, 2007, Vol. 41:
185–195
0028–8330/07/4102–0185 © The Royal Society
of New Zealand 2007
M06062; Online publication date 22 May 2007. Received 17 October 2006;
accepted 25 January 2007
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