13. 2   Boat Dredge

               This is a drag dredge for collecting shells as a feed for duck and prawn. It has a beam-like structure, made of iron bar of 20 mm. diameter. The rectangular mouth opening is about 80 cm. long and 18 cm. wide. The net is made of polyethylene minnow net, 400d/2 with 4 mm. mesh size. The triangular iron bar is used to control the vertical shape opening of the dredge. A polyethylene PE 0 14 is used as the towing rope.