Abstract: To evaluate the possibility of using stable isotopes for discriminating wild and farmed mangrove crabs, Stable carbon and nitrogen isotope ratios of Scylla paramamosion tissues were analyzed. The carbon and nitrogen isotope ratios of wild S. paramamosion were determined by the organic components of tissues, metabolic characteristics and stable isotopic compositions of food sources in the habitat, but were not related to body size (or age). The farmed S. paramamosion showed distinctly different carbon and nitrogen isotope compositions from the wild counterparts, which can provide valuable parameters for separating the origins of S. paramamosian products.