Comprehensive Description

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  Common names: jack (English), jurel (Espanol)
Uraspis helvola (Forster in Bloch & Schneider, 1801)

Whitemouth jack

Oblong, moderately compressed; snout rounded; mouth reaches under front part of eye; teeth small, pointed, curved, in bands in small fish, 1 row in large fish; gill rakers (excluding rudiments) 5-8 + 13-17; dorsal rays VIII+I, 25-30, first dorsal a low triangle, posterior spines of first dorsal fin may become embedded with growth); anal rays II (embedded in all but very young fish) + I, 19-22; pectorals long and curved; no isolated finlets behind dorsal and anal fins; anal spines reduced or absent; lateral line with pronounced arch anteriorly; with 23-40 small scutes (hard, spiny scales) on straight part of lateral line, those at rear point forwards; small scales over most of body, absent on breast and on base of pectoral, operculum partly scaled.

Body dusky, sometimes with 6 broad dark bars with narrow pale spaces between them; tongue, roof and floor of mouth white, remainder of mouth blue black.

Size: grows to at least 50 cm.

Habitat: coastal pelagic, typically occurs in small schools.

Depth: 10-300 m.

Circumglobal in tropical and temperate seas; known in the eastern Pacific from southern California, in the SW Gulf of California, the offshore islands (except Clipperton and the Galapagos) as well as Costa Rica and Panama, and the inshore islands of Gorgona and La Plata.


Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© Shorefishes of the tropical eastern Pacific online information system.

Source: Shorefishes of the Tropical Eastern Pacific Online Information System

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