Urea based osmoregulation and endocrine control in elasmobranch fish with special reference to euryhalinity

Hazon, N., Wells, A., Pillans, R. D., Good, J.n P., Anderson, W. G. and Franklin, C. E. (2003) Urea based osmoregulation and endocrine control in elasmobranch fish with special reference to euryhalinity. Comparative Biochemistry and Physiology Part B, 136 4: 685-700. doi:10.1016/S1096-4959(03)00280-X

Author Hazon, N.
Wells, A.
Pillans, R. D.
Good, J.n P.
Anderson, W. G.
Franklin, C. E.
Title Urea based osmoregulation and endocrine control in elasmobranch fish with special reference to euryhalinity
Journal name Comparative Biochemistry and Physiology Part B   Check publisher's open access policy
ISSN 1096-4959
Publication date 2003-12-01
Year available 2003
Sub-type Article (original research)
DOI 10.1016/S1096-4959(03)00280-X
Open Access Status Not yet assessed
Volume 136
Issue 4
Start page 685
End page 700
Total pages 16
Editor Mommsen, Thomas P. (Editor-in-Chief)
Walsh , Patrick J. (Editor-in-Chief)
Place of publication New York
Publisher Elsevier Science
Language eng
Subject C1
270604 Comparative Physiology
780105 Biological sciences
0601 Biochemistry and Cell Biology
Abstract 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 of marine dwelling elasmobranchs to varying environmental salinities under laboratory conditions has demonstrated that these fish do have the capacity to acclimate to changes in salinity through independent regulation of Na+, Cl- and urea levels. This suggests that many of the presumed stenohaline marine elasmobranchs could in fact be described as partially euryhaline. The contributions of Thomas Thorson in the 1970s demonstrated the osmoregulatory strategy of a fully euryhaline elasmobranch, the bull shark, Carcharhinus leucas, and more recent investigations have examined the mechanisms behind this strategy in the euryhaline elasmobranch, Dasyatis sabina. Both partially euryhaline and fully euryhaline species utilise the same physiological processes to control urea, Na+ and Cl- levels within the body fluids. The role of the gills, kidney, liver, rectal gland and drinking process is discussed in relation to the endocrine control of urea, Na+ and Cl- levels as elasmobranchs acclimate to different environmental salinities. (C) 2003 Elsevier Inc. All rights reserved.
Keyword Zoology
Rectal Gland
Dogfish Squalus-acanthias
Lesser-spotted Dogfish
Rectal Gland-function
Renin-angiotensin System
Stingray Dasyatis-sabina
Cell-volume Regulation
Body-fluid Regulation
Skate Raja-erinacea
Spiny Dogfish
Q-Index Code C1
Institutional Status UQ
Additional Notes This is a journal review

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Created: Wed, 15 Aug 2007, 12:11:50 EST