A study was conducted to evaluate the feasibility of tagging juveniles of the swimming crab Portunus trituberculatus with coded microwire tags （CWTs）. Feasibility was based on tag retention, and the effect of tagging site and juvenile size on growth and survival. These were evaluated after 20 days in short-term tagging experiments, and after 3-4 months in long-term ones. In the short-term experiments, no significant difference was observed in survival and growth between the control group and the tagged groups （more than 10 mm in long carapace width） into which one or two CWTs were injected into the basal muscle of the fifth pereiopod. Tag retention was more than 70% for crabs molted at least twice. In long-term experiments, the tagged crabs grew to commercial size exceeding 110 mm in long carapace width. Tag retention was about 90% and 10% for large-size （more than 20 mm in long carapace width） and small-size （13 mm in long carapace width） start groups, respectively.