Sebastes glaucus is a marine fish species in the family Scorpaenidae, commonly referred to as the blue or gray rockfish. It is native to the cold and temperate waters of the North Pacific Ocean, particularly along the coasts of Japan and adjacent regions. The genus name Sebastes derives from the Greek sebastos, meaning “venerable” or “august,” a term historically applied to this group of long-lived fishes, while the species epithet glaucus comes from Greek glaukos, meaning “bluish-gray” or “gleaming,” referring to the coloration of the fish. Like other members of the genus, it inhabits rocky reefs and benthic environments where it is associated with structured seafloor habitats.

Sebastes glaucus has a robust, spiny body typical of rockfish, with well-developed dorsal fin spines and a coloration that provides camouflage among rocks and kelp. It is a relatively slow-growing and long-lived species, feeding on smaller fish, crustaceans, and other marine invertebrates. Its ecological role as a mid-level predator contributes to the balance of reef and benthic ecosystems. Many Sebastes species exhibit viviparity, giving birth to live young rather than laying eggs, a trait characteristic of the genus.

Sebastes glaucus is valued for its firm, white flesh and mild flavor. It is used in a variety of culinary preparations, including grilling, simmering, steaming, and frying. In Japanese cuisine, rockfish species are often prepared in soy-based simmered dishes or served as grilled whole fish, where their flesh maintains structure while absorbing flavors. The texture and flavor profile make it suitable for both simple preparations and more complex seasoned dishes.

Nutritionally, Sebastes glaucus provides high-quality protein and contains beneficial marine lipids, including omega-3 fatty acids such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). It also supplies vitamins such as B12 and D, along with minerals including selenium and phosphorus. Bioactive compounds include taurine and small peptides generated during digestion, which have been studied for potential antioxidant and cardiovascular-supporting effects.