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Table 18.1--Acid Neutralizing Capacity (ANC) categories for brook trout response^a

μeq/L	Classification	Biological response
> 50	"not acidic"	reproducing brook trout populations expected where habitat is suitable
20 - 50	"transitional"	extremely sensitive to acidification; brook trout response variable
0 - 20	"episodically acidic"	sub-lethal and/or lethal effects on brook trout likely
< 0	"chronically acidic"	lethal effects on brook trout likely

^a Source: Bulger and others 1998

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