HomeFish encyclopediaRay-finned fishesPerch-like fishDriftfishesMan-of-war fish Man-of-war fish (Nomeus gronovii) Scientific name: Nomeus gronovii Gmelin, 1789 The Man-of-war fish (Nomeus gronovii) is a marine fish of the family Nomeidae. BiologyDorsal spines (total): 9 - 13; Dorsal soft rays (total): 24-28; Anal spines: 1 - 2; Anal soft rays: 24 - 29; Vertebrae: 41. Juveniles whitish or silvery with dark blue mottlings; pelvic fins black. Dark blue above, side silvery with patches of dark blue. Pelvic fin with inner rays joined to abdomen by membrane for its entire length.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameNomeus gronoviiFamilyNomeidae (Driftfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length39.0Depth range200–1000 m (656–3281 ft)EnvironmentMarine; demersal; depth range 200 - 1000 mClimateSubtropicalDistributionWestern Atlantic: Newfoundland, Canada and northern Gulf of Mexico to Brazil. Eastern Atlantic: north-west Africa and the Canary Islands; also S?o Tom? Island. Not recorded from the Mediterranean and most of the eastern Atlantic. Indian and Pacific: widely distributed.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: minor commercialResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026