3. Trammel Net
     The design of trammel net consists of three layers. The two outer layers have same twine and mesh size and number of vertical and horizontal meshes, the hanging rate is more stretched than the inner layer. The inner layer has smaller mesh size, finer twine and more slack. When the fish enter the first layer, they pass through eventually hitting the inner layer which envelops their bodies. They pass again to the 3rd layer where they are impounded. Trapping in the inner layer net does not allow the fish any chance of escape. The length of the head rope is ( 30 )m to (360)m and the height is ( 2 )m to ( 7.5 )m.
     The material of the trammel is made of nylon multifilament. Some trammel nets are made of nylon monofilament at the inner layer and nylon multifilament at the outer layers. The twine size of the inner net is 210D/2 – 210D/12 or 0.2mm, whereas that of the outer net is 210D/4 – 210D/12 or 0.2 – 0.5 mm. The mesh size of the inner net is 35 – 150 mm and that of outer net is 125 - 570 mm.
     The setting operation of the trammel net is like the drift gill net, carried out either by day or night time. The net is set across the tide and allowed to drift for one to two hours before hauling.

   
 
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     The New Monograph web begin 8 Nov 07