HomeFish encyclopediaRay-finned fishesPerch-like fishJawfishesStout jawfish Stout jawfish (Opistognathus crassus) Scientific name: Opistognathus crassus Smith-Vaniz, 2010 The Stout jawfish (Opistognathus crassus) is a marine fish of the family Opistognathidae. Native range: Western Indian Ocean, Ari Atoll, Maldive Islands. BiologyDorsal spines (total): 11; Dorsal soft rays (total): 11; Anal spines: 2; Anal soft rays: 10; Vertebrae: 26. This species is distinguished by the following set of characters: rigid maxilla with no flexible lamina posteriorly; D XI,11; A II,10; tips of dorsal-fin spines conspicuously pale; dorsum with row of 5 dark blotches, some of which extend distinctly onto dorsal fin; last blotch on dorsal fin much narrower than anterior blotches.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameOpistognathus crassusFamilyOpistognathidae (Jawfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length3.6Depth range35 m (115 ft)EnvironmentMarine; pelagic-neritic; depth range 35 - ? mClimateTropicalDistributionWestern Indian Ocean: Ari Atoll, Maldive 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