Trawlers' nets, also known as SEINES, are large fishing nets that are used by commercial fishermen to catch fish in the ocean. They are typically made of a long length of netting with weights along the bottom edge and floats along the top edge, allowing the net to be suspended in the water. The net is then dragged through the water, trapping any fish that are in its path. SEINES are an important tool for commercial fishermen, as they allow them to catch large amounts of fish quickly and efficiently.