noun
Ryukyu sweetfish
A subspecies of sweetfish (ayu) endemic to the Ryukyu Islands. Scientific name: Plecoglossus altivelis ryukyuensis.
See also: 鮎
リュウキュウアユは沖縄の川に生息する固有亜種です。
The Ryukyu sweetfish is an endemic subspecies that inhabits rivers in Okinawa.
Refers to the common sweetfish (Plecoglossus altivelis altivelis) found in mainland Japan, whereas リュウキュウアユ is a distinct subspecies limited to the Ryukyu Islands.
Compound of 琉球 (Ryūkyū, 'Ryukyu') and 鮎 (ayu, 'sweetfish'). The name directly describes the fish's geographic origin.