HomeFish encyclopediaRay-finned fishesPerch-like fishDriftfishesBlue fathead Blue fathead (Cubiceps caeruleus) Scientific name: Cubiceps caeruleus Regan, 1914 The Blue fathead (Cubiceps caeruleus) is a marine fish of the family Nomeidae. Native range: South Atlantic and Pacific. Western Central Atlantic, Also reported in Nicaragua, Uruguay, and Peru. BiologyDorsal spines (total): 12; Dorsal soft rays (total): 23-27; Anal spines: 2; Anal soft rays: 21 - 24; Vertebrae: 31. Pale to dark blue-grey, back darker than sides; caudal fin dark, other fins clear.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameCubiceps caeruleusFamilyNomeidae (Driftfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length25.6Depth range20–250 m (66–820 ft)EnvironmentMarine; pelagic-oceanic; depth range 20 - 250 mClimateTropicalDistributionSouth Atlantic and Pacific. Western Central Atlantic: Also reported in Nicaragua, Uruguay, and Peru.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (tm=1; tmax=4; K=0.66) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026