Record Display for the EPA National Library Catalog


Main Title Disease Incidence and Potential Mechanisms of Defense for MSX-Resistant and -Susceptible Eastern Oysters Held in Chesapeake Bay.
Author Chintala, M. M. ; Fisher, W. S. ;
CORP Author Environmental Research Lab., Gulf Breeze, FL. ;Maryland Univ., Cambridge. Horn Point Environmental Labs.
Publisher c1991
Year Published 1991
Report Number EPA/600/J-92/208;
Stock Number PB92-195650
Additional Subjects Chesapeake Bay ; Oysters ; Disease susceptibility ; Lysozyme ; Hemolymph ; Diagnosis ; Hemocytes ; Vibrio cholerae ; Seasonal variations ; Reprints ; Shellfish diseases ; Crassostrea virginica ; MSX disease ; Haplosporidium nelsoni ; Perkinsus marinus
Library Call Number Additional Info Location Last
NTIS  PB92-195650 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 7p
A disease of eastern oysters, Crassostrea virginica (Gmelin, 1791), caused by a protistan, Haplosporidium nelsoni, has caused great losses in the oyster fisheries of the northern Atlantic coast of North America. Certain oyster stocks have been selectively bred to survive infection by H. nelsoni (often called MSX disease) but mechanisms of resistance are not known and potential resistance to another protistan parasite, Perkinsus marinus, is not clear. Oysters from MSX-resistant stocks and from unselected (susceptible) stocks were compared over one year (1988-89) at an estuarine site in Chesapeake Bay where MSX disease and P. marinus ('dermo' disease) are both known to occur. Prevalence of MSX disease was 0%-4% for the resistant stock and 36%-60% for the susceptible stock, whereas prevalence of P. marinus was similar for both resistant (58%) and susceptible (67%) stocks. Comparison of putative defense mechanisms revealed no differences in hemocyte capacity to spread, respond to salinity changes or locomote in vitro. The susceptible stock exhibited higher serum protein concentrations and higher lysozyme concentrations during spring and summer. Serum agglutination titers for Vibrio cholerae CA401 were consistently higher for the resistant stock during summer; serum lectins could be related to disease resistance or affected by H. nelsoni infection.