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Species: Eucinostomus jonesii, Slender Mojarra

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body depth 30-32% SL
dark V mark on snout
tail base least depth 8.9-10.1% SL
8 lower gill rakers
scaleless pit before eyes not closed/restricted at front by scales
LL 47-48

Eucinostomus jonesii (Gunther, 1879)

Slender Mojarra

Body slender, fusiform, compressed, depth 30.2-32.1% of SL; eye large; 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; margin of bone under eye and of preopercle smooth; 7-8 lower gill rakers; dorsal fin IX, 10, 2nd spine </= 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; tail base least depth 8.9-10.1% 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 neither constricted on each side at front by scales, nor crossed by a row scales at front; lateral line scales 47-48.

Silvery; a dark V mark on snout; small fish with dusky diagonal bars and blotches on upper body, 2nd bar forming a Y under the spiny dorsal.

Grows to 20 cm.

Sand bottoms and seagrass beds in high energy areas, particularly surf zones and further offshore than most species in the genus; not in estuaries or brackish water

Depth: 0-45 m; adults in deeper water.

Bermuda to NE Brazil.

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  • Marine
  • Marine Only
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Sand & gravel
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Soft bottom only
  • Submerged vegetation
  • Beach
  • Reef (rock/coral/oyster)
  • Reef associated (reef + edges-water column & soft bottom)
FishBase Habitat
  • Demersal
  • Reef Associated
Feeding Group
  • Carnivore
  • Data
  • Data
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic gastropods/bivalves
  • Mobile benthic 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 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)
  • Tropical (10-23N, Nicaragua / Cuba)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 20
Depth Range Min
  • 0
Depth Range Max
  • 45