Years ago I managed to get a smallish white marlin to the boat, I'd say 60-80 lbs. Didn't want to deal with bringing it on-board, I managed to grab it by the base of bill to get the hook out and safely release it. Lotta fun.
It was really kind of random. Just decided to do a Saturday mid-afternoon boat ride with the girlfriend at the time and throw a couple of lines in to troll some frozen ballyhoo. Didn't even have the outriggers out, wasn't really trying, and only a couple miles offshore.
Then boom, and I see a billfish jump and fight it to the boat.