Yellowfin is the main species. The big boys, those 20 to 100 pounds can test your back any day of the year if you are lucky enough to come across a school of porpoises offshore. The big Tuna swim with them and the feed on the same baitfish. “Football” size tunas hang around floating debris or peak in schools in July and August and November and December. No wonder the Marlin peak at the same time.