Strange fish in Kekova

When anchored in Kekova there was a strange fish swimming close by the boat. It was swimming with speed in the surface for about 15 minutes. We saw the tail fin and the dorsal fin. They were about a meter apart so it was a big fish. The dorsal fin was clear blue.
What kind of fish was it?
My suggestion is a blue fin tuna, Ulla's is a blue shark and a friend's is a russian mini sub marine.

It was probably a Blue fish or Lüfer in turkish. Can be up to 2 m and is very aggresive if you catch it.