Known predators include: Japanese oyster drill Ocinebra japonica, predatory flatworm Pseudostylochus ostreophagus, Dungeness crab Cancer magister, rock crab C. productus, graceful crab C. gracilis, sun star Pycnopodia helianthoides, mottled star Evasterias troschelii, ochre star Pisaster ochraceus, pink star P. brevispinus.
Crabs and starfish pry the shells of the oyster open and consume the soft body on the inside. The Japanese oyster drill, a predatory snail, uses acid and a rough tongue to drill through the shell, then consumes the body (Pauley et al., 1988: 13,14).
Parasites: Mytilicola orientalis is known to occur in the small intestine of C. gigas. It is a small bright red crustacean that can damage tissue in the oyster. Boring sponges (Cliona celata) and sea worms (Plydora ciliate) also can be found on the oysters. They can weaken the shell by boring holes in it (Pauley et al., 1988: 15).
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