Neosalanx regani

Also known as Neosalanx reganius

The ariakehimeshirauo (Japanese: アリアケヒメシラウオ, 有明姫白魚 ariake·hime·shira·uo, meaning 'dawn princess ice fish'), Neosalanx reganius, is a species of icefish in the family Salangidae endemic to Japan. It is only known from Midori and Chikugo Rivers in Kyushu. Its maximum total length is , and has a lifespan of about one year. It seems to be relatively rare in its limited habitat, and is classified as an endangered species by IUCN.