Purse seine
A long wall of net set around a school of fish and drawn shut at the bottom like a drawstring purse.
Also: ring seine, seine net
A purse seiner finds a school, often by sonar, and runs a long net around it in a circle. A line through rings along the bottom of the net is then pulled tight, closing it beneath the fish, and the catch is hauled aboard. Purse seines catch most of the world's anchovies, sardines, herring and skipjack tuna. On India's south-west coast, ring seines, a smaller version used from traditional boats, catch much of the oil sardine and mackerel. Tuna seiners often set around floating objects called fish aggregating devices.