Russ,
When I fished at a rig out of Venice, LA in june, 2006, I could land yellowfin on jigs as there are not many blackfin, but I had to give up jigging yft on the 80 hour Carribean Sea trip as blackfin tuna were so thick. On the upcoming 52 hour Big E trip in Gulf of Mexico, I plan to experiment to cast jigs along with poppers for yft.