Trawl tub with line and two trawl anchors. When the line is stowed properly, the hooks hang over the top edge of the tub, so that they do not get entangled with the line. Trawl line is tarred cotton line, often about 1/4" in diameter. Gangings, or leaders, are spaced every fathom, each with a hook at the end. Tubs were often made from barrels cut in half.