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Species: Caranx crysos, Blue Runner, Blue Runner Jack

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operculum - black spot
C tips black
LL scutes 46-56

Caranx crysos (Mitchill, 1815)

Blue Runner, Blue Runner Jack

Body moderately elongate and compressed in adults; top jaw reaching to under center of eye; top jaw with an irregular outer row of canines and an inner band of fine teeth; lower jaw with one row of teeth; 25-28 lower gill rakers; margin of body at rear of gill chamber without papillae; pectoral fins longer than head; dorsal (VIII + I, 19-21) and anal (II+I, 19-21), front lobes of both fins distinctly raised; no finlets after 2nd dorsal and anal fins; tail base slender; tail strongly forked; straight rear part (but not curved front part) of lateral line with 46-56 scutes (large, hard spiny scales); tail base with a pair of keels on each side.

Body light blue to olive above, silvery below; a black spot at top corner of operculum; tips of tail fin black; juveniles with 7 dark bars on body.

Reaches 76 cm.

Usually over soft and seagrass bottoms, less common around reefs.

Depth range: 0-130 m.

Found on both sides of the Atlantic; Massachusetts to Brazil.

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  • Brackish
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Bottom + water column
  • Mid Water
  • Near Bottom
  • Near Surface
  • Surface
  • Sand & gravel
  • Submerged vegetation
  • Water column
  • Estuary
  • Reef associated (reef + edges-water column & soft bottom)
FishBase Habitat
  • Bentho-Pelagic
  • Reef Associated
Feeding Group
  • Carnivore
  • Data
  • Planktivore
  • Data
  • Zooplankton
  • Bony fishes
  • Mobile benthic crustacea (shrimps/crabs)
  • Pelagic jellyfish/ctenophores
Egg Type
  • Data
  • Pelagic
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean non-endemic
  • Transatlantic (East+West Atlantic)
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
  • 76
Depth Range Min
  • 0
Depth Range Max
  • 130