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An investigation of mercury-resistant bacteria was undertaken to determine their role in the accumulation of mercury in a simplified food chain. Oysters (Crassostrea virginica ) were maintained in a closed system, sealed aquarium with stirred, aerated water containing 10 μg of203 HgCl2 per liter. Uptake of203 Hg by oysters held under control conditions was compared with that of203 Hg uptake by oysters under similar conditions except that mercury-accumulating and mercury-metabolizing species ofPseudomonas , isolated from Chesapeake Bay, were added to the experimental oysters. After incubation for 4 days, the major portion of the203 Hg in the water column was found to be associated with the microparticulate fraction, corresponding to a rise in total viable count. Mercury accumulation in the oysters was significantly higher in the gill and visceral tissue than other tissues. Mercury concentrations were 200 times greater in tissue fractions of oysters dosed with mercury-metabolizing bacteria compared with the oysters held under control conditions without mercury-metabolizing bacteria.

Role of Bacteria in Bioaccumulation of Mercury in the Oyster Crassostrea virginica