Aluminum Toxicity to Brook Trout (SalvelinusFontinalis) in Acidified Waters
Aluminum was identified as a primary toxicant present in acidic, snow-melt runoff and lakes in the Adirondack Mountain region of New York. Covariance analysis of water quality data from fifty three Adirondack lakes suggested that stocked brook trout survival was determined primarily by aluminum concentrations, rather than pH or calcium levels. Lakes not supporting brook trout had a mean aluminum concentration of 0.29 mg/liter, as compared to 0.11 mg/liter of aluminum in lakes where stocked brook trout survived. Comparisons of mortality and gill pathology of brook trout exposed to acidic synthetic solutions and natural Adirondack waters with aluminum levels above 0.2 mg/liter, indicated a specific toxic response to aluminum at pH levels down to 4.4. An apparent increase in toxicity of fixed total aluminum levels with increasing pH suggested that changes in speciation involving hydroxy complexing enhances the toxicity of the aluminum cation.
KeywordsAcidify Water Aluminum Concentration Brook Trout Aluminum Toxicity Smallmouth Bass
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