Abstract
Potential for acclimation of brook trout, Salvelinus fontinalis, at sublethal levels of dissolved lead was measured. Samples of yearlings (19.2 ± 6.1 g) were preexposed continuously to environmentally realistic sublethal levels (10, 24, and 37 μg Pb/L) for 10, 20, 30, and 40 d and subsequently exposed to a lethal level (2 mg Pb/L), during which the incidence of mortality was recorded. Survival intervals of fish preexposed to 10 μg Pb/L were not significantly different from those preexposed to tap water (<2 μg Pb/L) in each preexposure interval. Fish preexposed to 24 μg Pb/L for 10 and 20 d were less resistant but returned to normal resistance after 30 and 40 d of preexposure. Fish preexposed to 37 μg Pb/L had significantly shorter survival intervals than those preexposed to tap water in each preexposure interval. The maximum acceptable toxicant concentration (MATC) of lead for brook trout is set between 24 and 37 μg Pb/L.
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