In some parts of the Pacific Northwest, fishing with baited traps is also common. Common commercial methods for catching shrimp and prawns include bottom trawling, cast nets, seines, shrimp baiting and dip netting. Bottom trawling often tears up the ocean bottom and can be very destructive to all bottom dwelling fish. Trawling involves the use of a system of nets deployed on or near the sea floor. Benthic trawling is towing or dragging a net at the very bottom of the ocean. Demersal trawling is towing a net just above the benthic zone. Midwater trawling (pelagic trawling) is trawling, or net fishing nearer the surface of the ocean.