Bigeyes almost look identical to Yellowfin. They have a longer pectoral fin... if you fold it forward it will touch its eye. Yellowfin will not touch the eye. I bet a lot of Bigeye were counted as Yellowfin. Ed FBig eyes are few and far between these days, not sure why. I have never got one, or if I remember even seen one, and I have spent a lot of time on the water.