Definition
A *moonfish*, also known as an opah, is a large, oval-shaped, and brilliantly colored fish found in oceans worldwide. Its disc-like shape resembles a full moon. They are warm-blooded, a rare trait among fish, allowing them to thrive in cooler waters. Think of them as the marathon runners of the sea! Unlike most fish, they can maintain a relatively constant body temperature. This advantage enables them to hunt more efficiently. They are solitary creatures, adding to their mystique.