Enoplosus armatus

Enoplosus armatus, the old wife (plural: old wives), is a species of perciform fish endemic to the temperate coastal waters of Australia. It is the only modern species in the family Enoplosidae.

It has a deep and compressed body and concave forehead. These features are characteristic of typical butterflyfishes. However, the old wife is easily distinguished by its silver-and-black, vertical, zebra-striped coloration, and by its two prominent dorsal fins. The second dorsal fin is very long and sickle-shaped. The fish grows up to 50 cm long.