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First published online September 14, 2007
Journal of Experimental Biology 210, 3422-3429 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.005744
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Efficiency of labriform swimming in the bluegill sunfish (Lepomis macrochirus)

Emily A. Jones, Kaitlyn S. Lucey and David J. Ellerby*

Department of Biological Sciences, Wellesley College, 106 Central Street, Wellesley, MA 02481, USA


Figure 1
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  		Fig. 1. Pectoral fin beat frequency in relation to swimming speed (closed circles). Red circle, mean fin beat frequency and speed achieved during labriform swimming. N=7, mean ± s.e.m.

 

Figure 2
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  		Fig. 2. Mechanical performance of a bluegill sunfish abductor superficialis muscle fascicle in vivo. (A) Fascicle stress production during an applied sinusoidal length change. The broken trace shows fascicle length, and the unbroken line fascicle stress. The bold line shows the timing of the applied stimulus. (B) Work loop obtained from the data in A by plotting fascicle stress against fascicle length. The area enclosed by the loop indicates the net work done by the fascicle. Stresses are shown relative to maximal isometric tetanic stress, P0, and strains relative to L0, the length at which maximum isometric tetanic stress was measured.

 

Figure 3
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  		Fig. 3. Changes in dissolved oxygen content within the flume created by a 150 g bluegill sunfish at rest (closed circles), and swimming at 1.2 fish lengths s–1 (open triangles). The grey bar represents a period when measurements were suspended to allow flushing of the flume chamber with oxygen-saturated water.

 

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© The Company of Biologists Ltd 2007