Japanese splendid perch
Callanthias japonicus
- Least concern
- Card rarity: Common
- Fish

Callanthias japonicus, the Japanese splendid perch or yellowsail sea bass, is a species of marine ray-finned fish belonging to the family Callanthiidae. This species is found in the northwestern Pacific Ocean.
Classification
- Class
- Actinopterygii
- Order
- Acanthuriformes
- Family
- Callanthiidae
- Genus
- Callanthias