Abstract
Acute, static 6-hour toxicity tests were conducted on two sizes each of lake trout and Atlantic salmon in the presence of three levels each of NaCl and CaCl2. Calcium did not protect smolts from NH3 toxicity but had no effect on the tolerance of Atlantic salmon fry to NH3. Both cations increased the tolerance of 8-g lake trout fingerlings to NH3, but neither significantly affected the toxicity of NH3 to 0.9-g lake trout fry. These results suggest that the mitigating effects of solution cations of NH3 toxicity may be related to species, size, and life stage.
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