Eleginus gracilis is a marine fish species in the family Gadidae, commonly known as saffron cod, distributed in the cold coastal waters of the North Pacific and Arctic regions, including northern Japan, the Sea of Okhotsk, the Bering Sea, and coastal Alaska and Siberia. The genus name Eleginus is derived from Latin roots suggesting a refined or elegant form, while the species epithet gracilis means “slender” or “graceful,” referring to the fish’s elongated body shape. The common name saffron cod refers to its yellowish belly, a characteristic unusual in cods, which gives the fish an overall yellow tone in its cold coastal habitat. It is a demersal species typically found in shallow coastal zones, estuaries, and river mouths, where it tolerates varying salinity levels and feeds on small invertebrates, crustaceans, and fish.

The fish has a relatively small, elongated body with a barbel on the chin, characteristic of cod-like fishes, and displays brownish to olive coloration that provides camouflage against sandy or muddy seabeds. It is well adapted to cold environments and plays an ecological role as both predator and prey within coastal food webs. Due to its abundance and accessibility in northern waters, Eleginus gracilis has long been an important subsistence and regional food fish.

Eleginus gracilis is valued for its mild, white flesh, which is soft and slightly sweet in flavor. In Japanese cuisine, particularly in Hokkaido, it is known as komai (氷下魚) when medium sized and oomai (オオマイ) when large sized. It is often prepared by drying, grilling, or lightly curing; the small fry are called gotappe (ゴタッペ) and are a common dried snack or accompaniment to alcoholic beverages. It may also be used fresh in soups, simmered dishes, or simple grilled preparations. The name of the fish comes from Ainu, where Eleginus gracilis has traditionally been used to make ruibe, frozen sashimi of high water content fish that melts in your mouth. These preparation methods reflect broader northern culinary adaptations emphasizing preservation and efficient use of coastal resources.

Nutritionally, saffron cod provides high-quality protein and is relatively low in fat compared with some other cold-water fish, though it still contains beneficial marine lipids including omega-3 fatty acids in modest amounts. It also supplies vitamins such as B12 and minerals including selenium and iodine. Bioactive compounds include small peptides formed during digestion or drying processes, which may have antioxidant or metabolic effects in experimental contexts.