Perkinsus marinus tissue distribution and seasonal variation in oysters Crassostrea virginica from Florida, Virginia and New York

TitrePerkinsus marinus tissue distribution and seasonal variation in oysters Crassostrea virginica from Florida, Virginia and New York
Type de publicationJournal Article
Year of Publication1998
AuteursOliver, LM, Fisher, WS, Ford, SE, Calvo, LMRagone, Burreson, EM, Sutton, EB, Gandy, J
JournalDiseases of Aquatic Organisms
Volume34
Pagination51 - 61
Date PublishedJan-01-1998
ISSN0177-5103
Résumé

ABSTRACT: Perkinsus rnarinus infection intensity was measured in eastern oysters Crassostrea virginica

collected in October and December 1993, and March, May, and July 1994 from 3 U.S. sites:

Apalachicola Bay (FL), Chesapeake Bay (VA), and Oyster Bay (NY). Gill, mantle, digestive gland,

adductor muscle, hernolymph, and remaining tissue (including gonadal material and rectum) were dissected

from 20 oysters from each site at each collection time. Samples were separately diagnosed for P.

marinus infections by incubation in Ray's Fluid Thioglycollate Medium (RFTM) and subsequent microscopic

quantification of punfied enlarged hypnospores. At all sampling times and sites, average P. marinus

infection intensity (g wet wt tissue-' or m1 hemolymph-') was lowest in hemolyrnph samples, and

generally highest in the digestive gland. Perkinsus marinus prevalence was 100% at both FL and NY

sites for each of the 5 collection times, and, for the VA site, was less than 100% in only 1 month (May

1994). Seasonal intensity patterns and mean total body burdens differed among the sites. Average body

burden was highest in VA during October and progressively declined to a minimum in May. This

decline was probably due to mortality of heavily infected oysters and diminution of parasite activity

associated with colder temperatures and reduced salinities. Intensities varied little during the months

of October and December at both the FL and NY sites. Minimum average intensities were observed in

March in FL oysters and May in NY oysters. Relatively high P. rnarinus infection levels that persisted

throughout the winter in NY oysters compared with VA oysters could reflect constant high salinity in

Long Island Sound which favors parasite activity, and

URLhttp://www.int-res.com/abstracts/dao/v34/n1/p51-61/
DOI10.3354/dao034051
Short TitleDis. Aquat. Org.