Capt. Pat Cavanaugh, of Pacific Dawn, has a method he believes is more effective than others. He attaches a 2-ounce torpedo sinker 2 to 3 feet above the hook with a light rubber band. "When a tuna is hooked up, the rubber band breaks, allowing you to fight the fish without dragging the sinker around," says Cavanaugh. This helps prevent the fish from tearing the hook loose, especially when it uncorks a violent headshake, which bluefin are prone to do.