HomeFish encyclopediaRay-finned fishesPerch-like fishRoversJapanese rubyfish Japanese rubyfish (Erythrocles schlegelii) Scientific name: Erythrocles schlegelii Richardson, 1846 The Japanese rubyfish (Erythrocles schlegelii) is a marine fish of the family Emmelichthyidae. Native range: Indo-West Pacific, known only from Japan (type locality), Korea, Natal (South Africa), Kenya and Gulf of Oman. Reported from the central South China Sea. BiologyInhabits the continental shelf area. Found to feed mainly on shrimp of the family Sergistidae and also on small mesopelagic fishes of the family Myctophidae, Astronesthidae and Paralepididae. Neither anterolateral glandular groove nor venom gland is present.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameErythrocles schlegeliiFamilyEmmelichthyidae (Rovers)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length72.0EnvironmentMarine; demersal, usually 215 - 300 mClimateDeep-waterDistributionIndo-West Pacific: known only from Japan (type locality), Korea, Natal (South Africa), Kenya and Gulf of Oman. Reported from the central South China Sea.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: commercialResilienceMedium, minimum population doubling time 1.4 - 4.4 years (tm=2; K=0.3) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026