HomeFish encyclopediaRay-finned fishesPerch-like fishRoundheadsRockfish Rockfish (Acanthoclinus fuscus) Scientific name: Acanthoclinus fuscus Jenyns, 1841 The Rockfish (Acanthoclinus fuscus) is a brackish-water fish of the family Plesiopidae. Native range: Southwest Pacific, endemic to New Zealand. BiologyDorsal spines (total): 20; Dorsal soft rays (total): 4; Anal spines: 9; Anal soft rays: 4Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAcanthoclinus fuscusFamilyPlesiopidae (Roundheads)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length30.0Depth range0–4 m (0–13 ft)EnvironmentMarine; brackish; demersal; non-migratory; depth range 0 - 4 mClimateTemperateDistributionSouthwest Pacific: endemic to New Zealand.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interestResilienceMedium, minimum population doubling time 1.4 - 4.4 years (tmax=9) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026