HomeFish encyclopediaRay-finned fishesPuffers and FilefishesFilefishesModest filefish Modest filefish (Thamnaconus modestoides) Scientific name: Thamnaconus modestoides Barnard, 1927 The Modest filefish (Thamnaconus modestoides) is a marine fish of the family Monacanthidae. Native range: Indo-West Pacific and Southeast Atlantic, south to Algoa Bay, South Africa; also Japan and northwestern Australia. BiologyDorsal spines (total): 2; Dorsal soft rays (total): 36-38; Anal spines: 0; Anal soft rays: 35 - 36. Greyish brown to purplish brown in color; membrane of spinous dorsal lemon yellow in males, greyish in females; other fins with pale blue, rays brownish.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameThamnaconus modestoidesFamilyMonacanthidae (Filefishes)OrderTetraodontiformes (Puffers and Filefishes)ClassActinopterygii (Ray-finned fishes)Maximum length30.0Common length25.0Depth range73–200 m (240–656 ft)EnvironmentMarine; reef-associated; depth range 73 - 200 mClimateTemperateDistributionIndo-West Pacific and Southeast Atlantic: south to Algoa Bay, South Africa; also Japan and northwestern Australia.Conservation status (IUCN)Not EvaluatedThreat 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