HomeFish encyclopediaRay-finned fishesPerch-like fishPerchesGuardian darter Guardian darter (Etheostoma oophylax) Scientific name: Etheostoma oophylax Ceas & Page, 1992 The Guardian darter (Etheostoma oophylax) is a freshwater fish of the family Percidae. Native range: North America, USA. BiologyAdults concentrate in headwaters and creeks in quiet to gently flowing pools, often near brush over sand or in gravel riffles.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameEtheostoma oophylaxFamilyPercidae (Perches)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length7.4EnvironmentFreshwater; benthopelagicClimateTropicalDistributionNorth America: 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