HomeFish encyclopediaRay-finned fishesFlatfishesLarge-tooth floundersShoal flounder Shoal flounder (Syacium gunteri) Scientific name: Syacium gunteri Ginsburg, 1933 The Shoal flounder (Syacium gunteri) is a marine fish of the family Paralichthyidae. Native range: Western Atlantic, northeastern Florida (USA), Gulf of Mexico, and the Antilles to Guyana. BiologyFound between the shore and 100 m depth, on sand or mud bottoms rich in organic matter. Feed mainly on shrimps (Penaeidae), amphipods, crustacean larvae and annelids. The whole life cycle develops on the continental shelf. During reproduction in May and September, adults gather in shallow waters of the estuaries and along the coast. Sexual activity takes place during the rainy season which corresponds to quite a large influx of organic matter, thereby ensuring food for the breeding fish. Sexual dimorphism affects the interorbital width and pectoral fin length of the hidden side. Juveniles remain planktonic for a long time with a high growth rate of >5% per day.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSyacium gunteriFamilyParalichthyidae (Large-tooth flounders)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length20.0Common length15.0Depth range27–95 m (89–312 ft)EnvironmentMarine; reef-associated; depth range 27 - 95 mClimateTropicalDistributionWestern Atlantic: northeastern Florida (USA), Gulf of Mexico, and the Antilles to Guyana.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: minor commercialResilienceHigh, minimum population doubling time less than 15 months (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