Crab-trap

              The crab-trap used widely in Thailand has a cylindrical body narrowing into a cone at one end, and with an entrance at the other end. The trap can either have a single entrance, or a two entrances, one of them in the middle of the trap. The shape of entrance is always funnel-like. Crab traps are made of split bamboo. The length of the trap is about 75-100 cm, with the maximum diameter of the cylindrical part about 26-28 cm. The diameter if entrance at the narrowest point is about 8-9 cm wide gaps. A piece of fish or some minced fish is used as bait. A bamboo skewer with bait is places in the center of the trap through two small loops which are provide for that purpose. About 20 traps are attached on one set of main line at 5 m intervals. The traps are hauled once or twice a day.
              In 1997, while the traditional crab traps are still being used in the rivers and mangrove area, the collapsible type is widely used in the sea, target on blue swimming crab. This collapsible crab trap is box-shape, made of iron or aluminum frame and cover with dark color net. Trap size is 300 mm X 450 mm X 20 mm with two horizontal entrance at both end. Fishes is used as bait, fixed at the central of the trap. Some large boats could operated up to 5,000 traps in one haul (time)