My trolling speed varies for many reasons, from the type of bait to the target species. For everyday marlin fishing with dead bait or lures, 8.5 knots is a good all-around speed. Both baits and lures run great, plus most boats have a great hum at this speed. For tuna fishing, I find a slower pace of 6.5 to 7 knots gets more bites than my everyday speed. Plus, at this speed, my boat throws a cleaner wake that the tuna seem to like. Live-bait fishing requires slow (2- to 4-knot) speeds, allowing live baits to swim naturally.