Trawling is the use of the movement of ships to tow fishing gear on the seabed or in the sea, forcing the fishing gear to enter the net bag through the fish, shrimp and crabs in the water area to achieve the purpose of fishing.
When the fishing boat drags the net forward, the net plate produces an expansion force under the action of the current, which can make the net expand horizontally. During operation, the fishing boat advances slowly and releases the net from the tail slide, connects the net plate to the hoist and makes it separate from the two net plate racks. Then the fishing boat moved quickly and gradually released two ropes. When the rope is released for a predetermined length, the fishing boat will trawl forward according to the predetermined towing direction and speed. The length of the cable release is generally 3 to 5 times the depth of the water. The trawl speed is generally 3 to 5 knots per hour. Start the net every 3 hours or so. When the net is lifted, the fishing boat moves forward slowly and takes in the noose ropes in turn. When the net is reeled to the net plate, the net plate is fixed on the net plate rack to separate it from the rope, continue to take the net and slide it from the tail Towed to the deck, take out the catch.