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Species: Eucinostomus argenteus, Spotfin Mojarra

All Families:   All Genera:   All Species:

slender (depth 33-37% SL)
back: 7 saddles, joining 6-9 flank blotches
D last spine 5.8-7.1% SL
8 lower gill rakers
A III, base 16.7-19.2% SL
scaleless pit before eyes constricted at front by scales

Eucinostomus argenteus Baird & Girard in Baird, 1855

Spotfin Mojarra

Body oval, fusiform, compressed, depth 32.7-36.5% of SL; the lower profile of the head distinctively concave; the mouth is highly extensible, pointing downward when protruded; jaws appear toothless but have tiny, brush-like teeth; lower border of preopercle smooth; bone under front of eye with smooth border; 8 (7-8) lower gill rakers; dorsal fin IX, 10, 2nd spine </= to distance between tip of snout and rear of eye, last spine short (5.8-7.1% of SL); pectoral not reaching to anal fin origin; anal rays III, 8, spines weak, 2nd spine short, < height of tail base, its base 16.7-19.2% SL; tail fin deeply forked; scales large, conspicuous and finely rough, covering most of head and body; dorsal and anal fins fold into a high scaly sheath along their bases; pectorals without scales; scales extend before front of eye on top of snout around scaleless groove that is constricted on each side at front by scales, but not crossed by a row scales at front.

Silver, with 6-9 faint dark spots along mid-side that join with 7 bars on upper back; outer part of spiny dorsal lightly dusky.

Grows to 20 cm.

Inhabits sand or mud bottoms of shallow coastal waters, occasionally entering estuaries and freshwater.

Depth: 0-76 m.

New Jersey to SE Brazil.

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  • Brackish
  • Freshwater
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Sand & gravel
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Soft bottom only
  • Estuary
  • Freshwater
  • Reef (rock/coral/oyster)
  • Reef associated (reef + edges-water column & soft bottom)
FishBase Habitat
  • Demersal
  • Reef Associated
Feeding Group
  • Carnivore
  • Data
  • Planktivore
  • Data
  • Zooplankton
  • Insects
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic gastropods/bivalves
  • Sessile worms
Egg Type
  • Data
  • Pelagic
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean non-endemic
  • West Atlantic 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
  • 20
Depth Range Min
  • 0
Depth Range Max
  • 76