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The buoyancy of bathypelagic fishes without a gas-filled swimbladder

Published online by Cambridge University Press:  11 May 2009

E. J. Denton  and
N. B. Marshall
E. J. Denton
Affiliation:
The Plymouth Laboratory
N. B. Marshall
Affiliation:
British Museum (Natural History)
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Extract

The upper reaches of the deep ocean contain many bathypelagic fishes with a capacious, gas-filled swimbladder. But living within and below this region are also numerous species in which this hydrostatic organ is absent or markedly regressed (Marshall, in preparation). In the neritic province nearly all the fishes that swim freely at the various water levels (and can stay poised at a particular level without undue effort) have a well-developed swimbladder, the capacity of which is about equal to 5 % of the body volume (Jones & Marshall, 1953). Having this amount of gas, these fishes are able to keep their weight in water close to the vanishing point. If such a fish were deprived of its swimbladder, it could keep at a constant level only by exerting a down-ward force equivalent to 5 % of its weight in air. The swimbladder thus saves the fish the energy needed for such effort, which is quite appreciable.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 37 , Issue 3 , October 1958 , pp. 753 - 767
Copyright
Copyright © Marine Biological Association of the United Kingdom 1958

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