Geographical traceability of marine bivalves is becoming increasingly important to assure their quality and to defend the interest of consumers and producers. This study verifies the neodymium isotopic ratio (Nd/Nd) in Ruditapes philippinarum shells as a tracer of the geographic origin, based on the geochemical aspect that Nd/Nd of their habitats strongly depends on the geology of its catchment areas. The Nd/Nd ratios of clam shells from the Japanese and Chinese coastal areas displayed a heterogeneous pattern from local to international scales, reflecting the geological age of the catchment area. The blind test suggested that a part of Manila clam was sold with mislabeling in the Japanese market, demonstrating the high potential of Nd/Nd to unmask the fraud labeling in a food market. Our findings emphasize the potential of Nd/Nd as a tracer for the geographical origin of marine bivalves, and also as a strong deterrent against mislabeling.
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