HomeFish encyclopediaRay-finned fishesEels and MoraysMoray eelsOne-spot moray One-spot moray (Gymnothorax monostigma) Scientific name: Gymnothorax monostigma Regan, 1909 The One-spot moray (Gymnothorax monostigma) is a marine fish of the family Muraenidae. Native range: Indian Ocean, Maldives and Christmas Island. Pacific Ocean: Caroline and Mariana islands and Papua New Guinea to the Marquesan and Tuamoto islands. BiologyDorsal spines (total): 0; Dorsal soft rays (total): 0; Anal spines: 0; Anal soft rays: 0. Plain brown moray that has a distinctive dark ring around each eye that extends backwards as a rectangular blotch and white spots surrounding each mucus pore around the mouth.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameGymnothorax monostigmaFamilyMuraenidae (Moray eels)OrderAnguilliformes (Eels and Morays)ClassActinopterygii (Ray-finned fishes)Maximum length44.0EnvironmentMarine; reef-associatedClimateTropicalDistributionIndian Ocean: Maldives and Christmas Island. Pacific Ocean: Caroline and Mariana islands and Papua New Guinea to the Marquesan and Tuamoto islands.Conservation status (IUCN)Not EvaluatedThreat to humansHarmless SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026