High salinities and temperatures significantly enhance infections in oysters of the pathogenic protozoan parasite Perkinsus marinus
(Andrews 1988, Burreson & Ragone-Calvo 1996, Soniat 1996, Chu & Volety 1997, Volety et al.
Realtime PCR for detection and quantification of the protistan parasite Perkinsus marinus
in environmental waters.
Spawned oysters were removed from individual cups, and shell height (mm), dry tissue weight (g), and Perkinsus marinus
(dermo) infection intensity were determined for each female.
Since the first report of Perkinsus marinus
infecting the American oyster Crassostrea virginica (Gmelin, 1791) in the Gulf of Mexico (Mackin et al.
LONG-TERM VARIATION OF POPULATION ATTRIBUTES AND PERKINSUS MARINUS
INFECTION IN OYSTERS FROM MISSISSIPPI GULF COAST
Effect of temperature and salinity on in vitro culture of the oyster pathogen, Perkinsus marinus
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.
When temperature rises along the east coast of the United States, perkinsosis disease causes massive mortalities of the adult Eastern oyster Crassostrea virginica infected by the protozoan Perkinsus marinus
(Andrews & Hewatt 1957).
This investigation into the physiological effects of Perkinsus marinus
on oyster physiology has shown that under conditions of air exposure and high temperature, oysters with high Perkinsus infections undergo a severe acidosis.
Every 4 mo (February, June, and October), 15 oysters were haphazardly removed from each bag to evaluate condition index and infection intensity by the protistan parasite Perkinsus marinus
, as described in Condition Index and Parasitic Infection.
Effect of salinity in Perkinsus marinus
susceptibility and defense-related activities in eastern oysters, Crassostrea virginica.
, and Haplosporidium nelsoni, in collected samples.