แปลสัมมนาBlue swimming crabs were collected on a monthly basis during October 2010 - July 2011 from small-scale fishers in three fishing villages: Ban Chang Lang in Sikao district, Ban Nam Rab in Kantang district and Ban Haad Sum Ran in Haad Sum Ran district. Each village used different types of trap. A traditional fixed box trap (30x45x20 cm) covered with a red polyethylene net with mesh size (m) of 4.3 cm (Figure 2a) was used in Ban Chang Lang, where fishers set an average of 100 traps per day per boat. The second type of trap was a collapsible vertical trap with a diameter of 50 cm covered with a green polyethylene net with mesh size of 5.0 cm (Figure 2b). It was used in Ban Nam Rab, where fishers set an average of 180 traps per day per boat. The third type of trap was the common collapsible box trap (35x50x20 cm) covered with a green polyethylene net with mesh size of 3.0 cm (Figure 2c). It was used in Ban Haad Sum Ran, where fishers set an average of 700 traps per day per boat