Shorefishes of the Greater Caribbean online information system

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Species: Macrodon ancylodon, King Weakfish

All Families:   All Genera:   All Species:

mouth large, oblique
A II (short, weak), 8-9
teeth = sharp arrowheads; front teeth - large, top 2 v large
preoperculum soft, weakly toothed
C - S shape

Macrodon ancylodon (Bloch & Schneider, 1801)

King Weakfish

Body elongate, compressed; eye moderately large; mouth oblique, large, lower jaw projecting; chin without pores, no barbells; snout with 2 marginal pores; teeth with sharp, arrow-head tips, large at front, 1 pr very large and curved at top front; margin of preopercle soft, weakly toothed; gill rakers 9-12, much shorter than gill filaments; top corner of gill opening notched; dorsal rays X+I, 27-29; anal rays II, 8-9, short base, second spine slender; edge of tail fin S shaped; scales small, smooth; soft dorsal and anal entirely scaled; pored lateral-line scales 45-55; the lateral line extends to the center of the end of the tail fin.

Color silvery greyish on back, pale yellowish below; base of pectoral fin dark; lower fins pale to yellowish.

Size: grows to 45 cm.

Inhabits coastal waters, including bays and estuaries.

Depth: 1-60 m.

Panama to central Brazil, strays to Hispaniola.

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  • Brackish
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Sand & gravel
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Soft bottom only
  • Beach
  • Estuary
  • Mud
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • Data
  • Planktivore
  • Data
  • Zooplankton
  • Bony fishes
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • Data
  • Pelagic
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean non-endemic
  • West Atlantic Endemic
Regional Endemism
  • Also in Brazil
  • Continent
  • Continent only
  • Extends South of GC
  • GC non-endemic
  • All species
  • Resident
Climate Zone
  • Tropical (10-23N, Nicaragua / Cuba)
  • Equatorial (0-10N, Costa Rica / Venezuela)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 45
Depth Range Min
  • 1
Depth Range Max
  • 60