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Summary Seafood is one of the most traded food commodities in the world with demand steadily increasing [1] . There is, however, a rising concern over the vulnerability of seafood supply chains to species mislabelling and fraud 1 , 2 . DNA methods have been widely used to detect species mislabelling and a recent meta-analysis of 4500 seafood product tests from 51 publications found an average of 30 percent were not the species stated on the label or menu [3] . This high rate poses a serious threat to consumer trust, reputations of seafood businesses and the sustainability of fishery resources. Seafood certification schemes may help reduce this problem. Here, we use DNA barcoding [4] to validate the species identity of 1402 certified seafood products derived from 27 species across 18 countries and find that in over 99% of cases species labelling was correct.