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Journal of Experimental Biology 85,295-309 (1980)
Published by Company of Biologists 1980

The Use of a New Tilting Tunnel Respirometer to Investigate Some Aspects of Metabolism and Swimming Activity of the Plaice (Pleuronectes Platessa L.)

I. G. PRIEDE ¹ and F.G. T. HOLLIDAY ²

¹ Department of Zoology, University of Aberdeen Scotland, U.K.
² Department of Zoology, University of Aberdeen Scotland, U.K.; Old Shire Hall, The University, Durham, England

1. Plaice and other flatfish can be induced to swim down a slope of about 60° against an upwelling water flow in a water tunnel.

2. A tilting Brett-type tunnel respirometer based on the above principle enabled laboratory experiments on swimming plaice to be carried out.

3. From trials at 5°, 10°, 15 °C, the relationship between specific swimming speed, V (body lengths s^-1), oxygen consumption, R (mg^-1. kg^-1 h^-1) and temperature, T is: log₁₀ = 0.3318V + log₁₀ (2.45T+26.52).

4. If the fish is resting (i.e. V = 0), the oxygen consumption is lower than predicted by the above equation. At rest:

R = 3.14T+2.66.

5. The cost of swimming in plaice is very similar to that of typical round fish such as haddock but the resting metabolic rate is lower than for haddock.

6. Before swimming, a negatively buoyant fish such as plaice must lift off the bottom. This cost of lift-off or posture effect makes it uneconomical for plaice to swim at speeds below 0.6V.

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