HomeFish encyclopediaRay-finned fishesPerch-like fishJawfishesGiant jawfish Giant jawfish (Opistognathus rhomaleus) Scientific name: Opistognathus rhomaleus Jordan & Gilbert, 1882 The Giant jawfish (Opistognathus rhomaleus) is a marine fish of the family Opistognathidae. Native range: Eastern Central Pacific, Baja California, Gulf of California, the Revillegigedo Islands (Socorro), and NW side of Isla del Ca?o, Costa Rica. BiologyInhabits sand-rubble bottoms. Feeds on benthic and planktonic invertebrates. Often caught by trawlers and anglers.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameOpistognathus rhomaleusFamilyOpistognathidae (Jawfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length51.0EnvironmentMarine; demersalClimateTropicalDistributionEastern Central Pacific: Baja California, Gulf of California, the Revillegigedo Islands (Socorro), and NW side of Isla del Ca?o, Costa Rica.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessUsesGamefish: yes SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026