HomeFish encyclopediaRay-finned fishesEels and MoraysMoray eelsSlendertail moray Slendertail moray (Gymnothorax gracilicauda) Scientific name: Gymnothorax gracilicauda Jenkins, 1903 The Slendertail moray (Gymnothorax gracilicauda) is a marine fish of the family Muraenidae. Native range: Pacific Ocean, Caroline and Mariana Islands to the Hawaiian, Line and Tuamoto Islands; throughout Micronesia. Recently reported from the Cocos Islands. BiologyInhabits corals and rocks of lagoon and seaward reefs. Mottled moray. Benthic. Possibly a protogynous hermaphrodite.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameGymnothorax gracilicaudaFamilyMuraenidae (Moray eels)OrderAnguilliformes (Eels and Morays)ClassActinopterygii (Ray-finned fishes)Maximum length32.0Depth range6–20 m (20–66 ft)EnvironmentMarine; reef-associated; depth range 6 - 20 mClimateTropicalDistributionPacific Ocean: Caroline and Mariana Islands to the Hawaiian, Line and Tuamoto Islands; throughout Micronesia. Recently reported from the Cocos 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