That's an interesting little fish, Scott: a juvenile man-of-war fish, Nomeus gronovii. As its name implies, juveniles live in a symbiotic relationship with Portuguese man-of-war, Physalia physalis. Although it somewhat resembles a jellyfish, the Portuguese man-of-war is actually a colonial hydrozoan that is more closely related to fire corals, Millepora spp. (which are not true corals) than it is to the jellyfishes. The relationship between the fish and its host appears to be mutual: The Portuguese man-of-war likely benefits from the man-of-war fish luring other fishes into its waiting tentacles, and the fish benefits by receiving protection from, and feeding on portions of, its hydrozoan host. The man-of-war fish is not immune to nor able to suppress the stings of the Portuguese man-of-war; rather, it is highly maneuverable and skillfully avoids the hydrozoan's potentially lethal tentacles. Adult man-of-war fish may reach nearly 16 inches in length and, unlike their young, live in offshore waters to depths in excess of 3,000 feet. The man-of-war fish is widely distributed in the tropical, subtropical, and warm temperate Atlantic, Pacific and Indian oceans, although it hasn't been reported from the Mediterranean Sea and is rare in portions of the eastern Atlantic. Due to its small size and the deep habitat frequented by adults, it has no commercial value. I have never tried eating one myself, and I've never read a report dealing with its food value.