HomeFish encyclopediaRay-finned fishesPerch-like fishGobiesEmerald goby Emerald goby (Ctenogobius smaragdus) Scientific name: Ctenogobius smaragdus Valenciennes, 1837 The Emerald goby (Ctenogobius smaragdus) is a marine fish of the family Gobiidae. Native range: Western Atlantic, South Carolina, USA to at least Pernambuco, Brazil; absent in the West Indies except Cuba. BiologyDorsal spines (total): 6; Dorsal soft rays (total): 11; Anal spines: 0; Anal soft rays: 12Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameCtenogobius smaragdusFamilyGobiidae (Gobies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length15.0EnvironmentMarine; demersalClimateTropicalDistributionWestern Atlantic: South Carolina, USA to at least Pernambuco, Brazil; absent in the West Indies except Cuba.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (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