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Corpus Systématique Animale

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Lipid content and composition of three species of Antarctic fish in relation to buoyancy

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  • A. Clarke 1
  • N. Doherty 1
  • A. L. DeVries 2
  • J. T. Eastman 3
  • 1) British Antarctic Survey, NERC, High Cross, Madingley Road, CB3 0ET, Cambridge, UK
  • 2) Department of Physiology and Biophysics, University of Illinois, 524 Burrill Hall, 61801, Urbana, IL, USA
  • 3) Department of Zoology, Ohio University, 45701, Athens, OH, USA

The lipip content and composition of various tissues from three species of nototheniid fish from McMurdo Sound, Antarctic have been examined in relation to their habitat and buoyancy. The pelagic midwater Dissostichus mawsoni is neutrally buoyant. It is rich in lipid which is located subcutaneously, as adipose tissue associated intimately with white muscle, and as lipid droplets within the cells of various tissues. White muscle, red muscle and liver are particularly lipid-rich, although the liver is not positively buoyant. The amount of lipid stored in the white muscle increases towards the centre of buoyancy of the fish. These deposits are documented at the anatomical, histological and ultrastructural levels. Tissues of Pagothenia borchgrevinki contain less lipid than D. mawsoni, but liver, red muscle and white muscle are still very rich in lipid. This species is cryopelagic, that is it spends most of the time in the water column just beneath the surface ice layer. It is not neutrally buoyant, but has a low weight in seawater. The tissues of the benthic Trematomus bernacchii contain only normal levels of lipid. The lipid class compositions of all three species are dominated by triacylglycerol, particularly when lipid contents are high. Serum lipids are an exception in containing high levels of the transport lipid sterol ester. The reason why Antarctic fish use triacylglycerols for buoyancy rather than was esters (as used by many myctophids) or squalene (as used by some sharks) is unclear.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - biology
  • 3 - marine biology & hydrobiology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - vertebres: zoologie generale, morphologie, phylogenese, systematique, cytogenetique, repartition geographique
Catégories Scopus
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - General Agricultural and Biological Sciences
Catégories WoS
  • 1 - science ; 2 - ecology
  • 1 - science ; 2 - biodiversity conservation
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Polar Biology

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