Fluke fish is another name for summer flounder, a large, predatory species of flatfish that lives in the North Atlantic. Fluke are flatfish, meaning that both eyes are on the same side of the body, side by side. They are noted for their fighting ability and flavor. Fluke have spots that look like eyes on their body, which is usually the easiest way to identify them. They are commonly called "Fluke" in the northeast U.S. .