HomeFish encyclopediaRay-finned fishesPerch-like fishCod icefishesBlue rockcod Blue rockcod (Notothenia cyanobrancha) Scientific name: Notothenia cyanobrancha Richardson, 1844 The Blue rockcod (Notothenia cyanobrancha) is a marine fish of the family Nototheniidae. Native range: Southern Ocean, Kerguelen and Heard Islands. Species factsScientific nameNotothenia cyanobranchaFamilyNototheniidae (Cod icefishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length30.0Common length20.0EnvironmentMarine; demersal; depth range 0 - ? m, usually 0 - 27 mClimatePolarDistributionSouthern Ocean: Kerguelen and Heard Islands.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interestResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Tmax=8; k=0.18) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026