Effects of Subchronic Exposure to Aluminium in Acidic Water on Bioenergetics of Atlantic Salmon ( Salmo salar).

JULIE C. BRODEUR; FINN OKLAND; BENGT FINSTAD; D. GEORGE DIXON; R. SCOTT MCKINLEY

ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY

Año: 2001 vol. 49 p. 226 - 234

0147-6513

Atlantic salmon (Salmo salar) were exposed for 36 days to water from the acidified (pH 5.2) Fossbekk River (Norway) with 50 lg ´L21 of aluminium (Al) added as AlCl3, or to circumneutral water (pH 6.6) from Ims River (Norway). Food consumption, cardiac output, swimming activity, and growth rate were measured to determine the effects of sublethal levels of Al in acidic water on the bioenergetics of the fish. Food consumption was reduced in acidic water and Al during the first 12 days, but was not significantly different from the control group during the rest of the exposure. A signi5cant decrease in body weight was concomitant with the reduction in food consumption. The fish also kept losing weight during the rest of the exposure despite the return of their appetite to normal. Cardiac output of the fish exposed to acidic water and Al was not significantly different from the control group after 36 days of exposure. Swimming activity remained significantly elevated throughout the exposure to acidic water and Al. These results indicate that sublethal levels of Al can alter the energy budget of Atlantic salmon living in acidified surface waters.