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PROGRESSION OF DISEASES CAUSED BY THE OYSTER PARASITES, PERKINSUS MARINUS AND HAPLOSPORIDIUM NELSONI IN CRASSOSTREA VIRGINICA ON CONSTRUCTED INTERTIDAL REEFS
Volety, A. K., F. O. Perkins, R. Mann, AND P. R. Hershberg. PROGRESSION OF DISEASES CAUSED BY THE OYSTER PARASITES, PERKINSUS MARINUS AND HAPLOSPORIDIUM NELSONI IN CRASSOSTREA VIRGINICA ON CONSTRUCTED INTERTIDAL REEFS. JOURNAL OF SHELLFISH RESEARCH 19(1):341-347, (2000).
The progression of diseases caused by the oyster parasites, Perkinsus marinus and Haplosporidium nelsoni, were evaluated by periodic sampling (May 1994 - December 1995) of oysters, Crassostrea virginica, on an artificial reef located in the Piankatank River, Virginia. The infections observed were recorded as a function of 1) prevalence and intensity, 2) oyster size and age, and 3) depth below mean low water at which the host oyster was found on the reef. Only a very small number of oysters were infected with the two species of pathogens on the oyster reef during the first eleven months of life. In the second year of oyster life, epizootiological patterns of disease development followed temperature and salinity trends. Oysters at residence depths < =45 cm below mean low water exhibited significantly (P<0.0001) lower prevalence and intensitiy of infections than oysters at depths >=90 cm. In contrast, oysters at residence depths >=90 cm had significantly higher growth rates (P<0.05) than those at <= 45 cm. However, size differences were not significant (P>0.05) at the end of the study. Results from this study may be used in managing oyster fisheries on natural or artificial reefs.
Record Details:Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Organization:U.S. ENVIRONMENTAL PROTECTION AGENCY
OFFICE OF RESEARCH AND DEVELOPMENT
NATIONAL HEALTH AND ENVIRONMENTAL EFFECTS RESEARCH LABORATORY
GULF ECOLOGY DIVISION