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Comparative Biochemistry and Physiology Part B 136 (2003) 685700 1096-4959/03/$ -see front matter 2003 Elsevier Inc. All rights reserved.

Summary: Comparative Biochemistry and Physiology Part B 136 (2003) 685700
1096-4959/03/$ - see front matter 2003 Elsevier Inc. All rights reserved.
Urea based osmoregulation and endocrine control in elasmobranch
fish with special reference to euryhalinity
Neil Hazon *, Alan Wells , Richard D. Pillans , Jonathan P. Good , W. Gary Anderson ,a, a b a a
Craig E. Franklinc
Department of Biology, Division of Environmental and Evolutionary Biology, Gatty Marine Laboratory, University of St. Andrews,a
St. Andrews, Fife KY16 8LB, Scotland, UK
Co-operative Research Centre for Coastal Zone, Estuary and Waterway Management Brisbane, QLD, Australiab
Department of Zoology and Entomology, University of Queensland, Brisbane, QLD 4072, Australiac
Received 3 April 2003; received in revised form 23 June 2003; accepted 2 July 2003
Since the landmark contributions of Homer Smith and co-workers in the 1930s there has been a considerable advance
in our knowledge regarding the osmoregulatory strategy of elasmobranch fish. Smith recognised that urea was retained
in the body fluids as part of the `osmoregulatory ballast' of elasmobranch fish so that body fluid osmolality is raised to
a level that is iso- or slightly hyper-osmotic to that of the surrounding medium. From studies at that time he also
postulated that many marine dwelling elasmobranchs were not capable of adaptation to dilute environments. However,
more recent investigations have demonstrated that, at least in some species, this may not be the case. Gradual acclimation


Source: Anderson, W. Gary - Department of Biological Sciences, University of Manitoba


Collections: Biology and Medicine