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In the Adriatic lagoons of northern Italy, manila clam ( Ruditapes philippinarum ) farming provides important socio-economic returns and local clams should be registered with the Protected Designations of Origin scheme. Therefore, there is a need for the development of rapid, cost-effective tests to guarantee the origin of the product and to prevent potential fraud. In this work, an elemental analysis (EA) coupled with isotope ratio mass spectrometry (IRMS) was employed to identify the isotopic fingerprints of clams directly collected onsite in three Adriatic lagoons and bought at a local supermarket, where they exhibited certification. In particular, a multivariate analysis of C/N, δ 13 C and δ 15 N in manila clam tissues as well as δ 13 C in shells and Δ 13 C (calculated as δ 13 C shell -δ 13 C tissues ) seems a promising approach for tracking the geographical origin of manila clams at the regional scale.

Traceability and Authentication of Manila Clams from North-Western Adriatic Lagoons Using C and N Stable Isotope Analysis