Carl, I like yer style.
My Sicilian grandmother was a incredible cook, especially fish & wild game. She taught me well.
She would inspect everything brought into her kitchen, and it better have met her high standards. If not, there would be a lesson, and a lecture about not wasting God's bounty.
Just about all fresh fish were made with heads on. Much easier to eat, and done correctly very few, to no bones. As you wrote, "note much left".
Every time I watch the movie Chinatown. I smile about the scene when baked fish are served at the Albacore Club, with heads on, and the eyes are not white. The fish look baked to perfection, and not having white eyes does not happen, except in the movies.
VP