Dietary salt intake and its relevance to ionic regulation in freshwater salmonids |
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| Authors: | N. F. Smith,C. Talbot,&dagger F. B. Eddy |
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| Affiliation: | Department of Biological Sciences, University of Dundee, Dundee DDI 4HN;Department of Agriculture and Fisheries for Scotland, Freshwater Fisheries Laboratory, Pitlochry, Perthshire, PH16 5LB, U.K. |
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| Abstract: | Dietary sodium intake for freshwater salmonids feeding in the wild (invertebrate diet) or in captivity (pellet diet) was calculated and compared with published branchial sodium influx values. Dietary sodium intake (mmol kg−1 per month) increases from winter minimum values of 5 and 30-40 to reach maximum values in summer of 175 and 240 for invertebrate and pellet diet, respectively. In summer, dietary sodium intake for fish feeding in the wild was of the same magnitude as branchial sodium influx. The implications of dietary sodium intake for sodium balance in freshwater fish are discussed. |
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| Keywords: | dietary sodium freshwater salmonids sodium balance |
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