Danish and Scottish seines are nets and lines used to catch species of ground fish, like sand dabs, sole, flounder and cod. Unlike trawling, which uses heavy cables, doors and trawls, Danish and Scottish seining use nets and lines spread out in a diamond shape along the sandy bottom of the ocean floor. The fish are herded into the path of the net by the lines, which gently stir up a mud cloud. Danish Seining keeps the boat in a fixed position and the gear is hauled along the bottom to get it back to the boat.
Scottish Seining tows the net and ropes along the ocean floor slowly, just enough to close the nets and bring the gear up to the boat, a method called "fly-dragging".
A) With a buoy on one end, nearly a mile of line and a light net are laid out from a boat that circles back to the buoy. The gear is lightweight, and used on smooth, sandy bottoms.
B) The circle of line and net is completed and the lines and nets fall to the bottom and gently settle. The boat slowly proceeds ahead, towing and pulling in the gear and catch, as the fish are herded into the net.
C) This slow, gentle method of pulling the gear and catch back to the vessel leaves dramatically less bottom degradation than trawling. It results in very low levels of bycatch, and nets are configured to result in less drag and more efficient fuel use.