Characterization of pathogenic bacteria of the ...



Title Characterization of pathogenic bacteria of the cupped oyster Crassostrea gigas
Author(s) M. Waechter, F. Le Roux, J. L. Nicolas, E. Marissal, F. C. J. Berthe
Journal Comptes Rendus Biologies
Date 2002
Volume 325
Issue 3
Start page 231
End page 238
Abstract The French mollusc production is mainly based on the Pacific cupped oyster, Crassostrea gigas. Since 1991, outbreaks of mass mortality of juveniles are reported during the summer period. These outbreaks are a major concern of oyster industry. Several studies have established given bacterial strains to be pathogenic for bivalve species, including oysters. Here we present a study of mortality outbreaks of C. gigas, as initiated in 1995. In a first step, bacterial strains were isolated during mass mortality outbreak and were biochemically characterised. Among the isolated strains, some strains of Vibrio splendidus biovar II were found to be pathogenic by means of experimental challenge of oyster juveniles. In the second step, a genotypical identification of the pathogenic strain was undertaken, based on 16S RNA sequences and phylogenetic analysis. It confirmed that the pathogenetic strain belonged to Vibrio splendidus biovar II.

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