Traps are an effective small-scale fishing gear for catching blue swimming crabs in Trang. Catch composition varies among the three gear types and fishing grounds. The management measure recommended from this study is based on the minimum size at maturity of the blue swimming crab. However, before any change in the legal mesh size of fixed box traps is implemented, further information on crab biology, socio-economic factors and the fishing grounds is required to properly assess the status of blue swimming crab stocks along the coast of Trang. Moreover, the catch composition among the three gear types also shows variation with respect to the fishing ground