Shorefishes of the Eastern Pacific online information system

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Species: Macrodon mordax, Dog-tooth weakfish, Toothed weakfish

All Families:   All Genera:   All Species:

C: S shape
front top & bottom jaws: large canines with arrow points
A: 9-10 rays, spines weak



Macrodon mordax (Gilbert & Starks, 1904)

Dog-tooth weakfish, Toothed weakfish

Body elongate, compressed; eye moderately large; mouth oblique, large, lower jaw projecting; chin without pores, no barbells; snout with 2 marginal pores; teeth large, pointed, with large canines at front, those on top jaw strongly curved, with arrow-head tips;  gill rakers 9-11;preopercle edge smooth; top corner of gill opening notched; dorsal rays IX-X+I, 27-30; anal fin with I-II weak spines, 9-10, with short base; pectorals long, reaching beyond tips of depressed pelvic fins;edge of tail fin S shaped; scales small, smooth; soft dorsal and anal entirely scaled; the lateral line extends to the center of the end of the tail fin; pored lateral-line scales 45-55.

Silvery, bluish or greenish greyish on upper back; axil of pectoral fin dark; fins whitish to slightly dusky.

Size: grows to 50 cm.

Inhabits coastal waters, including bays and estuaries.

Depth: 5-30 m.

Panama and Colombia.

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  • Brackish
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Bottom + water column
  • Near Bottom
  • Mid Water
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Water column
  • Estuary
FishBase Habitat
  • Bentho-Pelagic
Feeding Group
  • Data
  • Carnivore
  • Mobile benthic crustacea (shrimps/crabs)
  • Octopus/squid/cuttlefish
  • Bony fishes
  • Data
Egg Type
  • No data
  • Pelagic
  • Pelagic larva
Global Endemism
  • East Pacific endemic
  • Tropical Eastern Pacific (TEP) endemic
  • All species
Regional Endemism
  • TEP endemic
  • Continent
  • All species
  • Continental TEP endemic
  • Panamic province endemic
  • Continent only
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
IUCN Red List
  • Listed
  • Data deficient
  • Not listed
Length Max
  • 50
Depth Range Min
  • 5
Depth Range Max
  • 30