In 2011, Minado Restaurant in Natick substituted tilapia for red snapper, and escolar was advertised as white tuna. A manager at the time explained that escolar was the American name for white tuna. In 2012, Minado changed the red snapper sign at its buffet to read “tilapia,” the fish it was actually serving. But “white tuna” was written next to the word “escolar” — as if the two were interchangeable. They are not. Minado staff did not return calls seeking comment.