Citation:

Weis, P., J. Weis, J. Couch, C. Daniels, AND T. Chen. PATHOLOGICAL AND GENOTOXICOLOGICAL OBSERVATIONS IN OYSTERS (CRASSOSTREA VIRGINICA) LIVING ON CHROMATED COPPER ARSENATE (CCA) TREATED WOOD. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-93/373 (NTIS PB93228997).

Description:

Oysters living on chromated copper arsenate (CCA) treated wood in a residential canal were compared with oysters from a reference site 1.2 km distant. anal oysters were frequently green in color and had 15X more copper (app. 3 ug/g) than reference oysters. istological examination of soft tissues showed significantly more metaplastic degeneration in digestive gland diverticula of canal oysters. iemsa-stained canal oyster gill cells had twice as many micronuclei as did reference oyster gill cells. eference oysters caged by the CCA-treated wood in the canal had Cu tissue accumulations approaching that of native canal oysters by three months. hese did not show increased digestive gland metaplasia but did have a nearly doubled incidence of micronuclei. u has been shown to cause digestive gland pathology in bivalves; thus, the treated wood could be responsible for the observed pathology. he Cr and As from the wood, although not accumulated to the extent to which Cu is, could influence the non-specific response which we observed; Cr may also be responsible for the observed genotoxicity. ther possible stressors in the canal, e.g., boat exhaust, gardening chemicals) could also be involved.

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