HomeFish encyclopediaRay-finned fishesPerch-like fishDrums or croakersSmalltooth weakfish Smalltooth weakfish (Cynoscion steindachneri) Scientific name: Cynoscion steindachneri Jordan, 1889 The Smalltooth weakfish (Cynoscion steindachneri) is a freshwater fish of the family Sciaenidae. Native range: Western Atlantic, Guyana to Bel?m, Brazil. BiologyDorsal spines (total): 11; Dorsal soft rays (total): 21-24; Anal spines: 2; Anal soft rays: 10 - 12. Colour greyish above, whitish below. Dorsal fin dusky, upper margin of pectoral fins orange, pelvic fins and anal fin pale, caudal fin grey with a dark margin. Inside of mouth orange. Mouth large, distinctly oblique, lower jaw projecting. Tip of upper jaw without enlarged canines. Chin without barbels or pores. Snout with only 2 marginal pores. Pectoral fins much shorter than pelvic fins. Gas bladder with a pair of medium-sized, nearly straight, horn-like anterior appendages. Soft portion of dorsal fin almost entirely covered with small scales (Ref 51721).Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameCynoscion steindachneriFamilySciaenidae (Drums or croakers)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length110Common length45.0Depth range10 m (33 ft)EnvironmentMarine; freshwater; brackish; demersal; depth range 10 - ? mClimateTropicalDistributionWestern Atlantic: Guyana to Bel?m, Brazil.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: commercial; aquaculture: experimentalResilienceLow, minimum population doubling time 4.5 - 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