Abstract
Bonamia ostreae is a protozoan parasite that has caused severe losses in the flat oyster ( Ostrea edulis ) industry in Europe. The cupped oyster ( Crassostrea gigas ), recently introduced and cultured in Europe, is not infected by the disease. In vitro tests were conducted to determine whether there was a difference in the ability of hemocytes from each species to recognize and bind inert foreign particles (fluorescent latex beads) and purified, infective B . ostreae . The results indicated no difference in their ability to bind latex beads, but C . gigas were able to bind more B . ostreae than were O . edulis . The relative inability of the B . edulis hemocytes to recognize the parasite is discussed as a possible factor in flat oyster susceptibility.
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