| further evidence of regular sporulation by haplosporidium nelsoni in small oysters, crassostrea virginica. | during a field study to determine the susceptibility of the pacific oyster crassostrea gigas to chesapeake bay oyster pathogens, sporulation of haplosporidium nelsoni was observed in eastern oysters crassostrea virginica being used as controls. the c. virginica were obtained from 2 sources on 19 may 1993, a wild population in the upper rappahannock river, virginia (59.6 mm mean shell height) and a hatchery-reared population from chesapeake mari-culture that was held in the wye river, maryland (4 ... | 1994 | 7799147 |