HomeFish encyclopediaRay-finned fishesPerch-like fishDrums or croakersKing weakfish King weakfish (Macrodon ancylodon) Scientific name: Macrodon ancylodon Bloch & Schneider, 1801 The King weakfish (Macrodon ancylodon) is a brackish-water fish of the family Sciaenidae. Native range: Western Atlantic, Venezuela to northern Argentina. BiologyFound over mud or sandy mud bottoms in coastal waters to about 60 m depth. Juveniles abundant in estuaries and tidal mud flats. Feeds on shrimps and fishes. Important food fish.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameMacrodon ancylodonFamilySciaenidae (Drums or croakers)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length45.0Common length35.0Depth range60 m (197 ft)EnvironmentMarine; brackish; demersal; depth range ? - 60 m, usually ? - 25 mClimateSubtropicalDistributionWestern Atlantic: Venezuela to northern Argentina.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: minor commercialResilienceMedium, minimum population doubling time 1.4 - 4.4 years (K=0.44; tm=3; tmax=7) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026