Samples of culture freshwater milkfish (Chanos chanos) from five ponds surrounding open-air waste incineration sites and from five markets in southern Taiwan were analyzed for PCDDs, PCDFs and coplanar PCBs (Co-PCBs). The total TEQ concentration of three chemicals in fish meat was in a wide range of 0.195 to 153 pg/g wet weight. In addition, the bioconcentration factors from sediment to fish meat and crab hepatopancreas biota were arranged in order of Co-PCBs ⪢ PCDFs > PCDDs and Co-PCBs > PCDFs ⪢ PCDDs, respectively.