In this study, DNA barcoding was applied to identify the exact species of fi sh products from Shenzhen wholesale and retail markets and to check if these products are correctly labeled. Using mitochondrial cytochrome C oxidase subunit Ⅰ(COⅠ) gene as the target, the sequences of COⅠ from different samples were analyzed. Our results showed that the COⅠ gene sequences of all 77 samples examined were successfully amplifi ed by PCR. Howe ver, up to 36.36%(28/77)of them were inconsistent with their label descript...