Concomitant herpes-like virus infections in hatchery-reared larvae and nursery-cultured spat Crassostrea gigas and Ostrea edulis

Type Article
Date 2000-09
Language English
Author(s) Renault Tristan, Le Deuff Rose-Marie, Chollet Bruno, Cochennec NathalieORCID, Gerard Andre
Affiliation(s) Inst Francais Rech Exploitat Mer, Lab Genet & Pathol, F-17390 La Tremblade, France.
Source Diseases of aquatic organisms (0177-5103) (Inter-Research), 2000-09 , Vol. 42 , N. 3 , P. 173-183
WOS© Times Cited 90
Keyword(s) Apoptosis, Virus replication, Concomitant infection, Oyster mortality, Crassostrea gigas, Pacific oyster, Ostrea edulis, European flat oyster, Herpes like virus
Abstract Concomitant sporadic high mortalities were reported in France in May 1994 among batches of hatchery-reared larval Pacific oysters Crassostrea gigas and European flat oysters Ostrea edulis in 2 hatcheries, and in June and July 1994 among batches of cultured spat of both species in a shellfish nursery. Histological observation showed the presence of cellular abnormalities in moribund animals. Transmission electron microscopy revealed the presence of herpes-like virus particles in infected larvae and spat of both oyster species. This is the first description of a herpes-like virus infection in larval O.. edulis. Viruses observed in diseased larvae and spat of both species are similar with respect to ultrastructure and morphogenesis, They were detected simultaneously in C. gigas and O. edulis larvae and spat, indicating possible interspecific transmission. Moreover, these viruses are associated with high mortality rates in both oyster species. An electron microscopic examination revealed hemocytes with condensed chromatin and extensive perinuclear fragmentation of chromatin. These data suggest that herpes-like viruses infecting oysters may induce apoptosis in oyster hemocytes.
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Renault Tristan, Le Deuff Rose-Marie, Chollet Bruno, Cochennec Nathalie, Gerard Andre (2000). Concomitant herpes-like virus infections in hatchery-reared larvae and nursery-cultured spat Crassostrea gigas and Ostrea edulis. Diseases of aquatic organisms, 42(3), 173-183. Open Access version : https://archimer.ifremer.fr/doc/00000/820/