Blackfin and Yellowfin tuna are often found feeding in large groups on current driven bait balls in a specific location. When there is little to no current and the bait is spread out, trolling can be very effective. Blackfin, Yellowfin, and even Bluefin tuna will spread out around an oil rig or buoy when the current is down. When trolling for tuna, you want to catch their attention by using a teaser or an underwater dredge that imitates a school of squid or baitfish. In theory, the dredge or teaser will bring the fish into the bait spread that you are trolling; allowing them to single one of the baits rigged with a hook in it.