Effects of Chronic Aluminum Exposure on Swimming and Cardiac Performance in Rainbow Trout, <Emphasis Type="Italic">Oncorhynchus mykiss</Emphasis> |
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| Authors: | Email author" target="_blank">èB?DussaultEmail author RC?Playle DG?Dixon RS?McKinley |
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| Institution: | (1) Department of Environmental Biology, Centre for Toxicology, University of Guelph, N1G 2W1 Guelph, Ontario, Canada;(2) Department of Biology, Wilfrid Laurier University, 75 University Avenue West, N2L 3C5 Waterloo, Ontario, Canada;(3) Department of Biology, University of Waterloo, 200 University Avenue West, N2L 3G1 Waterloo, Ontario, Canada;(4) Department of Agroecology, University of British Columbia, 2357 Main Mall, V6T 1Z4 Vancouver, British Columbia, Canada |
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| Abstract: | Rainbow trout were exposed to 0–80 μg l−1 aluminum (Al) at pH 5.2 in synthetic soft water, for up to 8 weeks. Trout were submitted to an incremental swimming test to quantify their aerobic swimming capacity (Ucrit). After a simple, non-invasive cardiac surgery to install Doppler flow probes, their heart rate, cardiac output and stroke volume were measured while swimming at increasing water velocities. Fish exposed to Al accumulated significant amounts of Al at the gills (0–80 μg g−1) and in their liver (5–60 μg g−1) and had decreases in swimming capacity, ranging from 11 to 21%. Analysis of cardiac parameters during swimming revealed that increases in heart rate were used in trout exposed to the highest concentrations of Al to increase cardiac output, whereas control fish tended to increase cardiac output through increases in stroke volume. |
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| Keywords: | aluminum cardiac output gills heart rate trout |
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