1. The pectoral fin of bluefin do not reach past the beginning of the second dorsal fin. 2. The silver underside of a bluefin’s body is marked with white dots and uneven lines. 3. The second dorsal fin is a mix of grey and yellow in color. 4. The tail fin is dark blue in color.
A YFT will have second dorsal fin has yellow coloring &
The tail fin has yellow and grey coloring.