Resistance to Brown Ring Disease in the Manila clam, Ruditapes philippinarum: a study of selected stocks showing a recovery process by shell repair.

European stocks of the Manila clam Ruditapes philippinarum are affected by the Brown Ring Disease (BRD), which is caused by Vibrio tapetis. BRD is characterized by an accumulation of a brown organic matrix on the inner face of the shell. Clams that recover from BRD develop a white mineralized layer covering the brown matrix.