The Ryukyu ayu-fish lives in the demersal, amphidromous, freshwater, brackish, marine environment.
Oncorhyncus iwame Ryukyu ayu-fish - Plecoglossus altivelis ryukyuensis Hinamoroko - Aphyocypris chinensis Ushimotsugo - Pseudorasbora pumila subsp. More
the Ryukyu ayu-fish as Conservation status on the basis of declining and highly fluctuating population and limited and declining range and habitat. =References= * Akimichi, Tomoya. "". ''Kikkoman Soy Sauce Food Forum.'' Accessed on 21 December 2004. * Gadsby, Patricia. More