Comprehensive Description

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  Common names: jack (English), amberjack (English), bojala (Espanol), hojarán (Espanol)
Seriola rivoliana Valenciennes in Cuvier and Valenciennes, 1833

Almaco jack,     Pacific amberjack

Elongate, fusiform, relatively deep, compressed; upper head & body profile distinctly more convex that lower profile; snout long, pointed; mouth ends under center of pupil, supramaxilla bone above top jawbone very wide; gill rakers (excluding rudiments) 22-26; dorsal fin with VII-VIII spines (front spines may be imbedded in very large fish), then a notch before I, 27-33; anal fin II isolated spines (reduced or embedded in large fish) + I, 18-22, its base much shorter than soft dorsal base; front rays of dorsal and anal fins elongate, in a curved point; no isolated finlets after dorsal and anal fins; pectoral short (< head length); tail base with grooves on dorsal and ventral surface of tail fin base, but no lateral fleshy keel; lateral line with slight arch over pectoral region; no scutes (hard spiny scales) on lateral line.

Bluish to greenish on upper back, silvery below; oblique dark band from snout to front of dorsal fin; juveniles (up to 20cm) with oblique dark bar on head and 7 dark bars on side and tail base.

Size: attains at least 157 cm, common to 60 cm; at least 60kg.

Habitat: demersal and pelagic, mainly oceanic.

Depth: 3-250 m.

Circumtropical, in the eastern Pacific from Southern California to the SW Gulf of California to Peru, and the oceanic islands.


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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