We started with a relatively modest 26 pounds of drag at our strike setting. In the shallow water (around 180 feet deep) where the tuna were feeding, they could make fast runs but could not dive deep. With aggressive boat handling, we chased the fish, on plane in forward gear, and the tuna rarely got much over 100 yards of line off the reel in its first mad dash. Then, after the fish had burned all the available oxygen in its bloodstream, it would stop running and try to get a new supply of oxygen. That’s when Campbell, an expert angler, began pushing the drag up in order to put even more pressure on the fish, eventually to as much as 60 pounds.