HomeFish encyclopediaRay-finned fishesPerch-like fishPerchesSlough darter Slough darter (Etheostoma gracile) Scientific name: Etheostoma gracile Girard, 1859 The Slough darter (Etheostoma gracile) is a freshwater fish of the family Percidae. BiologyOccur in standing or slow-flowing water over mud, often in vegetation. Eggs are found attached to the substrate unguarded.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameEtheostoma gracileFamilyPercidae (Perches)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length6.0Common length4.3EnvironmentFreshwater; benthopelagicClimateSubtropicalDistributionNorth America: Mississippi River basin from central Illinois and northeastern Missouri to Louisiana; extends up Arkansas and Red River drainages to southeastern Kansas and eastern Oklahoma; and Gulf Slope drainages from Tombigbee River (1 record) in Mississippi to Nueces River in Texas in the USA.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (tmax=4) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026