QUICK SEARCH:   [advanced] Author: Keyword(s):
Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by TALBOT, C. Articles by JOHNSTON, J. Search for Related Content PubMed Articles by TALBOT, C. Articles by JOHNSTON, J.

Journal of Experimental Biology 101,61-70 (1982)
Published by Company of Biologists 1982

Osmoregulation in Salmon and Sea Trout Alevins

C. TALBOT ¹, F. B. EDDY ², and J. JOHNSTON ²

¹ Freshwater Fisheries Laboratory, Pitlochry, Perthshire PH16 5LB
² Department of Biological Sciences, Dundee University, Dundee DD1 4HN, Scotland

Changes in survival, body-water content, body electrolyte concentration and Na⁺ turnover rates were studied in alevins of Atlantic salmon (Salmosalar L.) and sea trout (Salmo trutta L.) at different developmental stages following exposure to various dilutions of sea water. In 100% sea water, salmon alevins at 9 days post-hatch survived approximately 6 h, and seatrout alevins 13 days post-hatch survived approximately 4 h. In both species, survival in hyperosmotic media decreased and rates of dehydration and Na⁺ turnover increased with age and development. The progressive change inresistance to osmotic stress is associated with a decrease in body surface area occupied by the relatively impermeable vitelline membrane and to the development of functional gills, leading to an increase in permeability to water and salt.