Cargados jawfish (Opistognathus simus) is a ray-finned fish of the family Opistognathidae. It inhabits marine (saltwater) waters in pelagic environments. This species can reach a maximum total length of 5.5 cm. With a trophic level of 3.4, it is a low-level carnivore, feeding on invertebrates and small organisms. It is assessed as Data Deficient on the IUCN Red List.
Dorsal spines (total): 11; Dorsal soft rays (total): 15; Anal spines: 3; Anal soft rays: 15 - 16; Vertebrae: 29. This species is distinguished by the following set of characters: rigid maxilla without flexible lamina posteriorly; D XI,15; body with about 53-62 oblique scale rows in longitudinal series; no scales anterolaterally forward of verticals from 5th or 6th segmented dorsal-fin rays; no pale basicaudal spots on caudal fin; no vomerine teeth .: elongated.
Behavioural data for Cargados jawfish is currently being reviewed.
Diet information for Cargados jawfish is currently being compiled.
Reproduction data for Cargados jawfish is currently being compiled.
Marine; pelagic-neritic; depth range 1 - ? m . Tropical known only from Cargados Carajos [= St.
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