Theragra chalcogramma is a species of marine fish in the family Gadidae, commonly known as Alaska pollock or walleye pollock. It inhabits the cold, nutrient-rich waters of the North Pacific Ocean, particularly the Bering Sea, Gulf of Alaska, and waters off northern Japan and Russia. The genus name Theragra is derived from Greek roots meaning “hunter of the sea,” while the species epithet chalcogramma comes from Greek chalkos (“copper”) and gramma (“line” or “mark”), likely referring to the subtle coloration patterns along its lateral line. In Japan, it is known as suzu-garei (スケトウダラ), and it is a cornerstone of both Japanese and international fisheries.

Theragra chalcogramma is a midwater schooling species with a silvery body, soft dorsal and anal fins, and a prominent lateral line used for detecting movement in the water column. It is a fast-growing, abundant fish that feeds primarily on zooplankton and small fish, making it an ecologically important forage species in North Pacific ecosystems. Its large-scale availability and mild flavor have made it a critical source of protein in processed seafood products worldwide.

As a food source, Alaska pollock is used fresh, frozen, or processed. In Japanese cuisine, it is commonly consumed as fillets, minced for surimi-based products such as imitation crab (kani-kamaboko), fish balls, or fish cakes, and incorporated into soups and tempura dishes. Internationally, it is also processed into frozen fillets, fish sticks, and other convenience seafood products. The flesh is lean, white, and mild in flavor, suitable for diverse culinary preparations.

Nutritionally, Theragra chalcogramma provides high-quality protein and is rich in omega-3 fatty acids, particularly eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), which contribute to cardiovascular and neurological health. The fish also contains vitamins such as B12 and D, as well as minerals including selenium and iodine.