HomeFish encyclopediaRay-finned fishesEels and MoraysMoray eelsY-bar moray Y-bar moray (Gymnothorax ypsilon) Scientific name: Gymnothorax ypsilon Hatooka & Randall, 1992 The Y-bar moray (Gymnothorax ypsilon) is a marine fish of the family Muraenidae. Native range: Pacific Ocean, southern Japan and the Hawaiian Islands. BiologyAnal spines: 0; Anal soft rays: 151 - 154; Vertebrae: 141 - 153. A species of Gymnothorax of moderate length. Dorsal fin moderately high, its origin before gill opening. Anus before mid-body. Jaw teeth sharp and uniserial. Body creamy light brown with 26-35 distinct, narrow, dark crossbars extending onto fins (some bars on most specimens Y-shaped). Anterior part of head uniformly light brown. Anal fin with a white margin. MVF 5-56-149.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameGymnothorax ypsilonFamilyMuraenidae (Moray eels)OrderAnguilliformes (Eels and Morays)ClassActinopterygii (Ray-finned fishes)Maximum length89.0Depth range120–185 m (394–607 ft)EnvironmentMarine; demersal; depth range 120 - 185 mClimateSubtropicalDistributionPacific Ocean: southern Japan and the Hawaiian 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