Abstract
Abstract Several strains of hatchery-reared brook trout, Salvelinus fontinalis (Mitchill), were exposed to low pH in the laboratory (sulfuric acid solutions) and in the field (mine acid polluted waters). Wild brook trout were also used in some field tests. Tests were both acute and chronic (up to 2 mo). Pronounced strain differences in survival ability were detected among embryonic, juvenile, and adult brook trout in laboratory tests, and among juvenile brook trout in field tests. However, in one case a strain difference in resistance times detected in field tests was not evident in several laboratory studies. A single selection of NYSV strain brook trout for high resistance to sulfuric acid solutions did not yield F1 progeny of greater resistance. Prior exposure to nonlethal acidic conditions also did not enhance resistance of brook trout. In some cases, the fish actually became more sensitive to the low test pH after such a prior exposure. Fish had longer resistance times in sulfuric acid solutions and ...
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