HomeMarine aquarium fishEels, lionfish & predatorsUndulated moray Undulated moray (Gymnothorax undulatus) Scientific name: Gymnothorax undulatus Lacep?de, 1803 The Undulated moray (Gymnothorax undulatus) is a marine fish of the family Muraenidae. BiologyA common species on reef flats among rocks, rubble, or debris and also occurs in lagoons and seaward reefs to depths of 26 m or more. Cavernicolous. Benthic. Nocturnal species that feeds on fishes, octopi, and probably crustaceans. Reported to be an aggressive species and prone to bite. Used in Chinese medicine.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameGymnothorax undulatusFamilyMuraenidae (Moray eels)OrderAnguilliformes (Eels and Morays)ClassActinopterygii (Ray-finned fishes)Maximum length150Depth range9–110 m (30–361 ft)EnvironmentMarine; reef-associated; depth range 9 - 110 mClimateTropicalDistributionIndo-Pacific: Red Sea and East Africa, including Walters Shoal to French Polynesia, north to southern Japan and the Hawaiian Islands, south to the southern Great Barrier Reef. Eastern Central Pacific: Costa Rica and Panama.Conservation status (IUCN)Not EvaluatedThreat to humansReports of ciguatera poisoningUsesFisheries: minor commercial; aquarium: commercial More eels, lionfish & predatorsRed lionfishPterois volitansGoldspotted eelMyrichthys ocellatusTiger snake eelMyrichthys maculosusSnowflake morayEchidna nebulosaBarred morayEchidna polyzonaYellow-edged morayGymnothorax flavimarginatusSee all eels, lionfish & predators SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026