Abstract
Tissues of Pacific oysters, Crassostrea gigas (Thun.), from the metal-rich Derwent Estuary, Tasmania, were examined using electron microscopy and the cellular metal concentrations measured by X-ray microanalysis. These data showed that 1. (1) all tissues contained elevated copper and zinc concentrations when compared with other bivalves (e.g. Mytilus), 2. (2) with the exception of reproductive tissues, calcium, iron, copper and zinc were present in the tertiary lysosomes, 3. (3) copper and zinc were selectively accumulated in membrane-limited vesicles of blood amoebocytes to cellular concentrations of ≈ 70 mM Cu and 390 mM Zn and 4. (4) these amoebocytes contain > 90% of the body copper and zinc.
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