Trawling? No. Sportfish boats don't trawl- that is commercial fishing pulling a net. Trawlers are also slow boats, and they burn little fuel. Those are outriggers, and they fold out and away from the boat. Attached to them are several lines which have release clips on them that are able to travel up and down the length of the rigger. You can then pull more fishing lines with either bait or lures attached at the end without tangles. In the center is called the "center rigger" which allows one or two lines to run down the center without tangles.