Enoplosus armatus
（重定向自Oldwife）
![](/Images/godic/202501/30/Enoplosus_armatus3746.jpg")
![Old wives are commonly found in pairs or large schools.[2]](/Images/godic/202501/30/Enoplosus_armatus_13746.jpg")
![The second dorsal fin is longer and sickle-shaped.](/Images/godic/202501/30/Enoplosus_armatus_23746.jpg")
![A 50-million-year-old fossil Enoplosus pygopterus with preservation of zebra markings[9]](/Images/godic/202501/30/Enoplosus_pygopterus_fossil3746.jpg")
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.