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Investigation of the prevalence of the protozoan parasite Perkinsus marinus in populations of intertidal oysters (Crassostrea vircjnica) from a South Carolina salt marsh led to the finding of a distinct, 4 phase cycle of infection intensity. The cycle consisted of characteristic quiescent, pre-virulent, virulent and remission stages of infection. For the first time, P. marinus infection intensity in South Carolina oysters was found to have a statistically significant positive correlation with temperature and salinity, and a negative correlation with oyster condition index. Our data also indicated that P. marinus infection in adult oysters from South Carolina is not size dependent. Based on a limited, qualitative h~stopathological of oyster tissue samples, we found no evidence to indicate the presence of Haplosporidium spp. in the North Inlet salt marsh/estuary system. These results strongly suggest that highly localized mass mortalities of oysters in North Inlet have been due to virulent levels of P. marinus mfecbons.

diseases of aquatic organisms

Seasonal infection intensity cycle of the parasite Perkinsus marinus (and an absence of Haplosporidium spp.) in oysters from a South Carolina salt marsh