HomeFish encyclopediaRay-finned fishesPerch-like fishSleepersEmerald sleeper Emerald sleeper (Erotelis smaragdus) Scientific name: Erotelis smaragdus Valenciennes, 1837 The Emerald sleeper (Erotelis smaragdus) is a brackish-water fish of the family Eleotridae. Native range: Western Atlantic, Bahamas, southeastern Florida and northern Gulf of Mexico in USA to Brazil. BiologyDorsal spines (total): 6; Dorsal soft rays (total): 11; Anal spines: 1; Anal soft rays: 9Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameErotelis smaragdusFamilyEleotridae (Sleepers)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length20.0EnvironmentMarine; brackish; demersalClimateTropicalDistributionWestern Atlantic: Bahamas, southeastern Florida and northern Gulf of Mexico in USA to Brazil.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