HomeFish encyclopediaRay-finned fishesPricklefishes, Bigscales and GibberfishesBigscale fishes or ridgeheadsLongjaw bigscale Longjaw bigscale (Scopeloberyx robustus) Scientific name: Scopeloberyx robustus G?nther, 1887 The Longjaw bigscale (Scopeloberyx robustus) is a marine fish of the family Melamphaidae. BiologyMesopelagic and bathypelagic at 340-1200 m depth. Oviparous, with planktonic eggs and larvae. Significant morphological variation between Indo-Pacific and other populations.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameScopeloberyx robustusFamilyMelamphaidae (Bigscale fishes or ridgeheads)OrderStephanoberyciformes (Pricklefishes, Bigscales and Gibberfishes)ClassActinopterygii (Ray-finned fishes)Maximum length7.3Depth range0–4740 m (0–15551 ft)EnvironmentMarine; bathypelagic; depth range 0 - 4740 m, usually ? - 500 mClimateDeep-waterDistributionCircumglobal: In tropical to temperate waters; except Arctic Ocean and Mediterranean Sea. Eastern Atlantic: Gulf of Guinea and west of the Canary Islands. Eastern Pacific: California Current region. Western Pacific: Kuril Island. South China Sea.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interest SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026