HomeFish encyclopediaRay-finned fishesPerch-like fishPerchesSeagreen darter Seagreen darter (Etheostoma thalassinum) Scientific name: Etheostoma thalassinum Jordan & Brayton, 1878 The Seagreen darter (Etheostoma thalassinum) is a freshwater fish of the family Percidae. Native range: North America, found only in Santee River drainage of North Carolina and South Carolina in the USA. BiologyInhabits rocky riffles of creeks and small to medium rivers.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameEtheostoma thalassinumFamilyPercidae (Perches)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length8.0Common length6.0EnvironmentFreshwater; benthopelagicClimateTemperateDistributionNorth America: found only in Santee River drainage of North Carolina and South Carolina in the USA.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceHigh, 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