HomeFish encyclopediaRay-finned fishesScorpionfishes and FlatheadsVelvetfishesThreefin velvetfish Threefin velvetfish (Neoaploactis tridorsalis) Scientific name: Neoaploactis tridorsalis Eschmeyer & Allen, 1978 The Threefin velvetfish (Neoaploactis tridorsalis) is a marine fish of the family Aploactinidae. BiologyBody scales form expanded spinous points; each scale forms a blade-like ridgeSource: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameNeoaploactis tridorsalisFamilyAploactinidae (Velvetfishes)OrderScorpaeniformes (Scorpionfishes and Flatheads)ClassActinopterygii (Ray-finned fishes)Maximum length5.0EnvironmentMarine; reef-associatedClimateTropicalDistributionWestern Pacific: Australia (known only from Rottnest Island and Shark Bay in Western Australia and One Tree Islands, in the Capricorn Group of the southern Great Barrier Reef). Recently reported from the Chesterfield Islands.Conservation status (IUCN)Not EvaluatedThreat to humansHarmless SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026