Transepithelial ion exchange in smolting atlantic salmon (Salmo Salar L.) |
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| Authors: | D R N Primmett F B Eddy M S Miles C Talbot J E Thorpe |
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| Institution: | (1) Department of Human Anatomy, University of Oxford, South Parks Road, OX1 1QX Oxford, U.K.;(2) Department of Biological Sciences, University of Dundee, DD1 4HN Dundee, U.K.;(3) Freshwater Fisheries Laboratory, PH16 5LB Pitlochry, U.K. |
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| Abstract: | Whole-body (but predominantly gill) Na+ exchange, gill Na+/K+/ATPase activity and seawater tolerance were examined in juvenile Atlantic salmon during the smolting period. Transepithelial net Na+ gain decreased steadily from late February showing a net loss in April and early May, returning to approximate equilibrium in mid-May. This seasonal net loss of Na+ to the environment occurred slightly after maximal gill epithelial Na+/K+/ATPase activity and preceded maximal seawater tolerance. The results are discussed in relation to changes in gill permeability and salt intake via the diet. |
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| Keywords: | Na+ exchange salmon migration stress |
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