Objective In this study， we aimed to investigate and analyze the adulteration of retail aquatic products （fish） via species identification.Methods We used DNA barcoding technology to identify the various sources of retail aquatic products （fish） in retail channels in Shenzhen with COⅠ as the target gene.Results The statistics of the results of BOLD system identification indicated that Lepidocybium flavobrunneum was listed as tuna in 120 retail aquatic products （fish） samples from Shenzhen market. Furthermore， the categorization of some aquatic products was unclear， and the classification of Oncorhynchus species such as rainbow trout as “salmon” was controversial.Conclusion Adulteration and label non-compliance of retail aquatic products （fish） is prevalent in Shenzhen market. Strengthening supervision and continuous standardization of the market order is therefore suggested.