QUICK SEARCH:   [advanced] Author: Keyword(s):
Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Webber, D. M. Articles by Smale, M. J. Search for Related Content PubMed PubMed Citation Articles by Webber, D. M. Articles by Smale, M. J. Social Bookmarking                         What's this?

The Journal of Experimental Biology 204, 3561-3570 (2001)
© 2001 The Company of Biologists Limited

Caudal differential pressure as a predictor of swimming speed of cod (Gadus morhua)

D. M. Webber^1,2,*, R. G. Boutilier², S. R. Kerr¹ and M. J. Smale³

¹ Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4J1,
² Department of Zoology, Cambridge University, Downing Street, Cambridge CB2 3EJ, UK and
³ Port Elizabeth Museum, PO Box 13147, Humewood 6013, South Africa

*e-mail: dmwebber{at}is.dal.ca

Accepted July 9, 2001

We report the results of an experiment designed to investigate the feasibility of using differential pressure to estimate the swimming speed and metabolic rate of Atlantic cod (Gadus morhua). Seven cod were fitted with a miniature differential pressure sensor mounted on one side of the caudal peduncle immediately anterior to the base of the caudal fin rays. Relationships between differential pressure, tailbeat frequency, tailbeat amplitude, swimming speed and rate of oxygen consumption (_O2) were determined as a function of the swimming speed of cod swimming at 5°C in a recirculating ‘Brett-style’ respirometer. Tailbeat differential pressure, tailbeat amplitude and tailbeat frequency were highly correlated with swimming speed. The average or integrated pressure ranged from 0 to 150 Pa for speeds up to 0.8 m s^–1 (1.1 L s^–1, where L is total body length), while the ‘pressure difference’ (maximum minus minimum pressure) ranged from 0 to 900 Pa. Small changes in swimming speed of less than 0.05 m s^–1 were readily detected as differences in tailbeat pressure. Burst swimming in the respirometer resulted in huge pressure ‘bursts’ of up to 5000 Pa ‘pressure difference’.

The rate of oxygen consumption increased exponentially and was highly correlated with swimming speed (r²=0.77). The rate of oxygen consumption was also correlated with tailbeat integrated pressure (r²=0.68) and with differential pressure (r²=0.43); regression correlations were always greater for individuals than for combined data from all cod.

The results detailed in this study indicate that an ultrasonic differential pressure transmitter would enable accurate estimates of the swimming speed, rates of oxygen consumption and activity patterns of free-ranging fish in nature.

Key words: cod, Gadus morhua, pressure, swimming speed, tailbeat frequency, bioenergetics, oxygen consumption, fish.

CiteULike    Complore    Connotea    Del.icio.us    Digg    Reddit    Technorati    Twitter    What's this?

This article has been cited by other articles:

				P. W. Webb Kinematics of plaice, Pleuronectes platessa, and cod, Gadus morhua, swimming near the bottom J. Exp. Biol., July 15, 2002; 205(14): 2125 - 2134. [Abstract] [Full Text] [PDF]