Seine nets

Seine nets usually have two long wings and a section that concentrates and retains the catch. Lengths of rope are added to the end of each of the wings. These ropes are negatively buoyant and extend the working area of the net while adding minimum drag to the hauling operation. The nets function on the principle that fish are reluctant to swim over a moving object in the water and instead try to swim in front of it. The fish are thus herded by the ropes and wing ends into the net.
Beach seine nets (also called haul seines, pocket seines, baitfish seines, garfish seines, snapper seines, hauling seines, seines or estuary seines) are used Australia-wide to catch many species, including mullet, whiting, Australian Salmon, garfish, Tailor and bream. The net may have a loose section of netting acting as the bunt area for retaining fish, or may have a bag at one end of the net or in the centre. Beach seine nets can be set around a sighted school of fish, or in an area where fish are known to congregate. The net is set from a dinghy or can be walked out in shallow water, with the first length of rope being set perpendicular to the shore, the net set parallel to the shore, and the second rope set back to the shore. The ropes are then hauled onto the beach evenly, by hand, four-wheel drive vehicle or tractor, herding the fish into the net. Hauling continues until the net and fish are dragged onto the shore, or the fish are concentrated in the bag.

http://fish.gov.au/fishing_methods/Pages/nets.aspx