If there are schools of dolphin around, blues will often be nearby since the fish are a food source. Most marlin fishermen favor artificial lures over natural bait. Artificials can be trolled faster than natural baits, so a larger area can be covered and the baits are not destroyed by the speed. These baits are usually rigged to skip on the surface or swim just below it. Blues are not noted for hitting deeply trolled baits.
Some anglers like to use live bait.
The most popular are bonito, small tuna and dolphin. Tackle for marlin does not need to be massive, but it must be top quality. Most fishermen should use 80-pound. Regardless of tackle, be in good physical shape to battle a marlin. It is important that hooks be sharp.