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Effects of Acid Water and Aluminum on Parr–Smolt Transformation and Seawater Tolerance in Atlantic Salmon, Salmo salar
- Source :
- Canadian Journal of Fisheries and Aquatic Sciences. 50:1816-1827
- Publication Year :
- 1993
- Publisher :
- Canadian Science Publishing, 1993.
-
Abstract
- Smolting Atlantic salmon, Salmo salar, were kept from 11 April to 24 May in soft water of pH 5 or in soft water of pH 5 and 50 μg aluminum (Al)∙L−1. Control fish were kept in soft water of pH 6.3–6.5. Water temperature was 8–14 °C. In mid-May, some of the control smolts were transferred to the test conditions for 8 d. Exposure to acid water resulted in osmoregulatory failure and high mortality rate. Al strongly enhanced toxicity. Sensitivity to low pH or low pH/Al exposure greatly increased when fish had developed to seawater tolerant smolts. In control and acid-exposed fish, gill carbonic anhydrase activity remained unchanged throughout the experiment whereas in Al-exposed fish, carbonic anhydrase activity decreased. Gill Na+K+-ATPase activity in control fish peaked in mid-May simulanteously with development of seawater tolerance. Fish from both acid-exposed groups had low seawater tolerance. Na+,K+-ATPase activity declined to 60% of start value in acid-exposed fish and to parr level in Al-exposed fish. Hypoosmoregulatory ability was linearly correlated with gill Na+K+-ATPase activity. Reduction in plasma Na+concentration in acid-exposed fish was linearly correlated with the reduction in gill Na+,K+-ATPase activity.
Details
- ISSN :
- 12057533 and 0706652X
- Volume :
- 50
- Database :
- OpenAIRE
- Journal :
- Canadian Journal of Fisheries and Aquatic Sciences
- Accession number :
- edsair.doi...........1df89422580a13d9e7db20790226fb1c