HomeFish encyclopediaRay-finned fishesPuffers and FilefishesFilefishesBlackvent filefish Blackvent filefish (Thamnaconus melanoproctes) Scientific name: Thamnaconus melanoproctes Boulenger, 1889 The Blackvent filefish (Thamnaconus melanoproctes) is a marine fish of the family Monacanthidae. Native range: Western Indian Ocean, Gulf of Aden, Oman, and Gulf of Oman. Western Central Pacific. BiologyDorsal spines (total): 2; Dorsal soft rays (total): 32-34; Anal spines: 0; Anal soft rays: 32 - 34. Caudal fin slightly rounded.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameThamnaconus melanoproctesFamilyMonacanthidae (Filefishes)OrderTetraodontiformes (Puffers and Filefishes)ClassActinopterygii (Ray-finned fishes)Maximum length20.0Depth range30–200 m (98–656 ft)EnvironmentMarine; demersal; depth range 30 - 200 mClimateTropicalDistributionWestern Indian Ocean: Gulf of Aden, Oman, and Gulf of Oman. Western Central Pacific.Conservation status (IUCN)Data deficient (DD)Threat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (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