Examination of the slides, performed decades later, revealed an epizootic of Haplosporidium nelsoni
By 2006, this 54-yr record covered a number of unique periods, including the period of time after the onset of MSX, a disease caused by the protozoan Haplosporidium nelsoni
, circa 1957 (Haskin and Andrews, 1988; Ford, 1997) and the period after the onset of Dermo, a disease caused by the protozoan Perkinsus marinus, circa 1990 (Ford, 1996; Cook et al.
A third "Dark Age" began for the oyster industry in the late 1950's when a new disease, later named MSX aid caused by the Haplosporidium nelsoni
parasite, began to kill huge quantities of oysters in Delaware and Chesapeake Bays.
2008), Denman Island disease of the European oyster (Ostrea edulis) (Gagne 2008), and two diseases, Haplosporidium nelsoni
(or multinucleated sphere unknown, or MSX) and Perkinsus marinus, in the eastern oyster (Crassostrea virginica) (Burreson et al.
Unfortunately, for managing oyster populations, obstacles exist in meeting this objective because oyster populations do not appear to be inherently equilibrious, particularly those subjected to MSX, a disease caused by the protozoan Haplosporidium nelsoni
, or Dermo, a disease caused by the protozoan Perkinsus marinus.
ABSTRACT A selective breeding program for Crassostrea virginica was established in 1997 as part of an initiative in Virginia to address declining oyster harvests caused by the two oyster pathogens Haplosporidium nelsoni
(MSX) and Perkinsus marinus (Dermo).
KEY WORDS: eastern oyster, Crassostrea virginica, fecundity, Perkinsus marinus, Haplosporidium nelsoni
Infection and mortality patterns in strains of oysters Crassostrea virginica selected for resistance to the parasite Haplosporidium nelsoni
In addition, artificial selection for 4 generations based on survival, growth, and disease susceptibility has produced a strain with dual resistance to the parasites Haplosporidium nelsoni
The Suminoe oyster is also relatively resistant to the protozoan parasites Haplosporidium nelsoni
and Perkinsus marinus (Calvo et al.
Increased virulence in an introduced range: Haplosporidium nelsoni
(MSX) in the Eastern oyster Crassostrea virginica.
Both diploids and triploids were similarly infected by Perkinsus marinus and, to a lesser extent, by Haplosporidium nelsoni