HomeFish encyclopediaRay-finned fishesPerch-like fishSea chubsBlue knifefish Blue knifefish (Labracoglossa nitida) Scientific name: Labracoglossa nitida McCulloch & Waite, 1916 The Blue knifefish (Labracoglossa nitida) is a marine fish of the family Kyphosidae. Native range: Southwest Pacific. BiologyOccurs inshore over reef areas. Swim either singly or in small schools, moving very rapidly and erratically, stopping occasionally to gulp down a few large planktonic crustaceans.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameLabracoglossa nitidaFamilyKyphosidae (Sea chubs)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length20.0Common length15.0EnvironmentMarine; pelagic-neritic; depth range 0 - ? m, usually 0 - 20 mClimateTemperateDistributionSouthwest Pacific.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