HomeFish encyclopediaRay-finned fishesPerch-like fishDrums or croakersFreshwater croaker Freshwater croaker (Plagioscion ternetzi) Scientific name: Plagioscion ternetzi Boulenger, 1895 The Freshwater croaker (Plagioscion ternetzi) is a freshwater fish of the family Sciaenidae. Native range: South America, Paraguay.and lower Paran? River basins. Species factsScientific namePlagioscion ternetziFamilySciaenidae (Drums or croakers)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length39.0EnvironmentFreshwater; benthopelagicClimateTropicalDistributionSouth America: Paraguay.and lower Paran? River basins.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