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Aspects of the Circulatory Physiology and Muscle Systems of Deep-Sea Fish

Published online by Cambridge University Press:  11 May 2009

J. H. S. Blaxter ,
C. S. Wardle  and
B. L. Roberts
J. H. S. Blaxter
Affiliation:
Dunstaffhage Marine Research Laboratory, P.O. Box 3, Oban, Argyll
C. S. Wardle
Affiliation:
Marine Laboratory, P.O. Box 101, Aberdeen
B. L. Roberts
Affiliation:
The Laboratory, Citadel Hill, Plymouth
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Extract

Mesopeiagic fish without swim bladders, found in depths from 100 to 1000 m, have soft bodies with a very high water content (88–95%) low haematocrits (5–9%), smallhearts, a low proportion of red muscle, and large lymph ducts. Species possessing swim bladders have a lower water content (70–83%), higher haematocrits (14–35%), larger hearts, more prevalentred muscle and smaller lymph ducts. Some active surface species have still less water (64–74%) and higher haematocrits (48–57%).

The soft watery fish appear to use skeletal reduction and high water content asa buoyancy mechanism but there is no evidence, judging from analyses of freezing-point depression of the plasma and muscle fluid, that they maintain an extra low ionic content to assist buoyancy. Although oxygen is probably adequate in the deep water, there may be some constraint on activity because the oxygen-carrying capacity ofthe blood is low and oxygen may be limited at the tissues. This is partly compensated for by the high proportion of anaerobic white muscle and the large lymph system. These watery fish appear to be best adapted to short bursts of activity. Nevertheless they do make diel vertical migrations which may cause them to reach the limits of their aerobic metabolic systems.

The mesopeiagic species with swim bladders are much more similar in their circulatory characteristics to inshore fish. They also make quite substantial vertical migrations with the concomitant problem of adjusting buoyancy by varying the pressure within the swim bladder. Metabolically this is unlikely to be unduly difficult.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 51 , Issue 4 , November 1971 , pp. 991 - 1006
Copyright
Copyright © Marine Biological Association of the United Kingdom 1971

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