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INTRODUCTION In Europe, brown ring disease (BRD) affects the clam

In Europe, brown ring disease (BRD) affects the clam
Ruditapes philippinarum, a species introduced for
aquaculture in the 1970s. The disease was first recog-
nized in 1987 in France, causing high mortalities and
severe losses in cultured stocks. The etiological agent
of BRD, a pathogenic bacterium named Vibrio tapetis,
invades the clam's pallial (mantle) cavity, where it
adheres to the periostracal lamina at the growing edge
of the shell (Paillard et al. 1994, Borrego et al. 1996a).
Subsequent disruption of periostracal deposition allows
the bacterium to penetrate into the extrapallial space
and results in a brown organic deposit on the inner
shell, which gives the disease its name. In severely dis-
eased clams, V. tapetis has been detected using im-
munological methods within cells of the digestive
diverticula (Plana 1995), in the extrapallial fluid (Allam
et al. 2000b), and within the connective tissue of the
mantle (Santamaria et al. 1995). These observations
were associated with degeneration of the digestive


Source: Allam, Bassem - School of Marine and Atmospheric Sciences, SUNY at Stony Brook


Collections: Biology and Medicine; Environmental Sciences and Ecology