HomeFish encyclopediaRay-finned fishesPuffers and FilefishesFilefishesBlacklined filefish Blacklined filefish (Pervagor nigrolineatus) Scientific name: Pervagor nigrolineatus Herre, 1927 The Blacklined filefish (Pervagor nigrolineatus) is a marine fish of the family Monacanthidae. Native range: Western Pacific, Japan to Western Australia and the Solomon Islands. BiologyDorsal spines (total): 1 - 2; Dorsal soft rays (total): 29-33; Anal spines: 0; Anal soft rays: 25 - 30. Dark brownish green to grayish green head and back, lower portions noticeably whitish; dark brown to pale orange iris; dark brown lips. Caudal fin membranes usually orange anteriorly, dusky posteriorly; other fins clear; spinous dorsal similar to body color. Pelvic fin rudiment moderate in size, broadly attached to posterior margin of ventral flap. Midbody scales variable in size. Scale rugosities in males usually develop at about 50 mm SL. Varies considerably with respect to squamation, coloration, fin-ray counts and max. size across its range.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific namePervagor nigrolineatusFamilyMonacanthidae (Filefishes)OrderTetraodontiformes (Puffers and Filefishes)ClassActinopterygii (Ray-finned fishes)Maximum length10.0Depth range8–25 m (26–82 ft)EnvironmentMarine; reef-associated; depth range 8 - 25 mClimateTropicalDistributionWestern Pacific: Japan to Western Australia and the Solomon Islands.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceHigh, 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