HomeFish encyclopediaRay-finned fishesEels and MoraysMoray eelsRichardson's moray Richardson's moray (Gymnothorax richardsonii) Scientific name: Gymnothorax richardsonii Bleeker, 1852 The Richardson's moray (Gymnothorax richardsonii) is a marine fish of the family Muraenidae. Native range: Indo-Pacific, Red Sea and East Africa to the Society Islands, north to the Ryukyus, south to the Cook Islands; Mariana and Caroline islands in Micronesia. BiologyDorsal spines (total): 0; Dorsal soft rays (total): 0; Anal spines: 0; Anal soft rays: 0. Dark brown with darker mottling, a lighter chin and throat, and white margins around the lip pores.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameGymnothorax richardsoniiFamilyMuraenidae (Moray eels)OrderAnguilliformes (Eels and Morays)ClassActinopterygii (Ray-finned fishes)Maximum length32.0Depth range10 m (33 ft)EnvironmentMarine; reef-associated; depth range ? - 10 mClimateTropicalDistributionIndo-Pacific: Red Sea and East Africa to the Society Islands, north to the Ryukyus, south to the Cook Islands; Mariana and Caroline islands in Micronesia.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