Abstract
1. 1. In situ plasma sodium concentrations of yellow perch ( Perca fluvescens) from naturally acidic Wharton lake (pH 4.6) and naturally alkaline Trout lake (pH 7.9) were similar. 2. 2. Exposure to lethal acidity (pH 3.2) for 48 hr resulted in significant but similar decreases in plasma sodium levels in both populations, even though Whartor lake perch were known to survive significantly longer than Trout lake perch at low pH. 3. 3. This suggests that the observed differences in acidity tolerance between the two populations are not due to differences in rates of plasma sodium decrease.
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