HomeFish encyclopediaRay-finned fishesPerch-like fishGobiesSmoothbelly goby Smoothbelly goby (Sicydium gymnogaster) Scientific name: Sicydium gymnogaster Ogilvie-Grant, 1884 The Smoothbelly goby (Sicydium gymnogaster) is a freshwater fish of the family Gobiidae. Native range: Central America, Atlantic slope rivers from Misantla, Veracruz, Mexico to Honduras. Species factsScientific nameSicydium gymnogasterFamilyGobiidae (Gobies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)EnvironmentMarine; freshwater; brackish; demersal; amphidromousClimateTropicalDistributionCentral America: Atlantic slope rivers from Misantla, Veracruz, Mexico to Honduras.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