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Species: Seriola rivoliana, Almaco Jack, Almaco Jack Amberjack

All Families:   All Genera:   All Species:

body deep
oblique bar: eye to D1
D2 lobe 16-25% FL
juv: 6 bars (with pale center-line), 7th on tail base, NOT onto D & A
top jaw: top bone wide, corner angular

Seriola rivoliana Valenciennes in Cuvier & Valenciennes, 1833

Almaco Jack, Almaco Jack Amberjack

Body 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 rear of top jawbone very wide at rear, with sharp angle at top corner; gill rakers (excluding rudiments) 24-29 in small fish, 18-25 in large; 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, 2nd dorsal lobe height 16-25% of fork length; no finlets after 2nd dorsal and anal fins; pectoral short (< head length); tail base slender, with grooves on dorsal and ventral surface of tail fin base, but no lateral fleshy keel; tail strongly forked; 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 20 cm) with oblique dark bar on head and 7 dark bars (each with a narrow, irregular pale vertical centerline) on side and tail base that do not extend onto dorsal and anal fin bases.

Size: attains at least 160 cm, common to 60 cm; at least 60 kg.

Habitat: demersal and pelagic, mainly oceanic.

Depth: 3-340 m.

Circumtropical; Cape Cod to Argentina.

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  • Marine
  • Marine Only
  • In & Offshore
  • Inshore
  • Offshore
Water Column Position
  • Bottom
  • Bottom + water column
  • Mid Water
  • Near Bottom
  • Near Surface
  • Water column
  • Reef associated (reef + edges-water column & soft bottom)
FishBase Habitat
  • Bentho-Pelagic
  • Reef Associated
Feeding Group
  • Carnivore
  • Data
  • Data
  • Bony fishes
  • Mobile benthic crustacea (shrimps/crabs)
  • Octopus/squid/cuttlefish
Egg Type
  • Data
  • Pelagic
  • Pelagic larva
Global Endemism
  • All species
  • Circumtropical ( Indian + Pacific + Atlantic Oceans)
  • Greater Caribbean non-endemic
Regional Endemism
  • Also in Brazil
  • Continent
  • Continent + Island (s)
  • Extends N + S of GC
  • Extends North of GC
  • Extends South of GC
  • GC non-endemic
  • Island (s)
  • All species
  • Resident
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
  • Subtropical (23-35N, Florida / Carolinas / Bermuda)
  • Temperate (>35N)
  • Tropical (10-23N, Nicaragua / Cuba)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 160
Depth Range Min
  • 3
Depth Range Max
  • 340