HomeFish encyclopediaRay-finned fishesBony tonguesFeatherbacks or knifefishesGiant featherback Giant featherback (Chitala lopis) Scientific name: Chitala lopis Bleeker, 1851 The Giant featherback (Chitala lopis) is a freshwater fish of the family Notopteridae. Native range: Asia, Borneo, Sumatra and Java in Indonesia, Malaya, and Thailand. Found in the Mekong basin. Protected in Indonesia as Notopterus sp. BiologyJaws increasing in length throughout life, extending far beyond posterior margin of eye in large specimens; small juveniles with slightly oblique bars on body and anal fin; larger juveniles and adults with plain body, overall silvery to bronze in life.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameChitala lopisFamilyNotopteridae (Featherbacks or knifefishes)OrderOsteoglossiformes (Bony tongues)ClassActinopterygii (Ray-finned fishes)Maximum length150EnvironmentFreshwater; demersalClimateTropicalDistributionAsia: Borneo, Sumatra and Java in Indonesia, Malaya, and Thailand. Found in the Mekong basin. Protected in Indonesia as Notopterus sp..Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceVery Low, minimum population doubling time more than 14 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