HomeFish encyclopediaRay-finned fishesPerch-like fishCod icefishesScaly rockcod Scaly rockcod (Trematomus loennbergii) Scientific name: Trematomus loennbergii Regan, 1913 The Scaly rockcod (Trematomus loennbergii) is a marine fish of the family Nototheniidae. Native range: Southern Ocean, coasts of Antarctic Peninsula, Queen Mary, Adelie, South Victoria Coasts, Davis, Ross and Weddell seas. BiologyFound more commonly at depths greater than 300 m. Feeds on amphipods (mainly Orchomene plebs), errant polychaetes, and in lesser amounts, fishes. Isopods and other crustaceans are probably included in the diet.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameTrematomus loennbergiiFamilyNototheniidae (Cod icefishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length30.0Common length20.0Depth range0–1191 m (0–3907 ft)EnvironmentMarine; bathydemersal; depth range 0 - 1191 m, usually 65 - 832 mClimateDeep-waterDistributionSouthern Ocean: coasts of Antarctic Peninsula, Queen Mary, Adelie, South Victoria Coasts, Davis, Ross and Weddell seas.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interestResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Fec = 5,900) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026