HomeFish encyclopediaRay-finned fishesPerch-like fishJawfishesYellowmouth jawfish Yellowmouth jawfish (Opistognathus melachasme) Scientific name: Opistognathus melachasme Smith-Vaniz, 1972 The Yellowmouth jawfish (Opistognathus melachasme) is a marine fish of the family Opistognathidae. Native range: Western Atlantic, North Carolina in USA to Cuba and eastern Mexico. Species factsScientific nameOpistognathus melachasmeFamilyOpistognathidae (Jawfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length10.0Depth range146–265 m (479–869 ft)EnvironmentMarine; demersal; depth range 146 - 265 mClimateSubtropicalDistributionWestern Atlantic: North Carolina in USA to Cuba and eastern Mexico.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