Stout jawfish (Opistognathus crassus), first described by Vaniz, 2010 is a tiny fish in the family Opistognathidae (order Perciformes). Adults typically reach 3.60 cm in maximum length. It inhabits marine coastal and open-ocean environments. Recorded depth range: 35 to 35 metres. It occurs in Tropical waters. It is broadly omnivorous, taking invertebrates, plant matter, and detritus. On the IUCN Red List, it is classified as Data Deficient.
Dorsal 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 .: elongated.
Behavioural data for Stout jawfish is currently being reviewed.
Marine; pelagic-neritic; depth range 35 - 35 m . Tropical Indian Ocean: Maldive Islands.
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