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Species: Rhonciscus crocro, Burro Grunt

All Families:   All Genera:   All Species:

body speckled
juvenile: wavy stripes center flank
D XIII, 11-13
A 2nd spine long, thick
8 rows scales above LL
LL 66-72

Rhonciscus crocro (Cuvier in Cuvier & Valenciennes, 1830)

Burro Grunt

Body elongate, robust, (depth 29-36% of SL), strongly compressed; eye moderate 6.7-7.8% SL; rear margin of bone under eye concealed by scales; mouth small to moderate size, inside not red, lips thin; chin with 2 pores at front and 2 inside hole behind, plus a longitudinal groove; preopercle coarsely serrated, ventral serrations not forward pointing; 7-9 short, blunt lower gill rakers; dorsal fin XIII, 11-13; anal rays III, 6-7, second anal spine long and thick; scales over entire body and head except front of snout, lips and chin; lateral-line scales 66-72; 8 scale rows above and 16 rows below lateral line; soft dorsal fin with a low sheath of scales on its base but no scales on membranes between rays.

Adults: dark olivaceous above, silvery below; fins dusky; soft dorsal with a black margin; sides with dusky spots; juveniles with several indistinct wavy dark stripes along centerline of body

Size: grows to 33 cm.

Inhabits soft bottoms and vegetation in turbid shallow water; often in rivers.

Depth: 0-10 m.

Florida to Brazil.

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  • Brackish
  • Freshwater
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Sand & gravel
  • Soft bottom only
  • Submerged vegetation
  • Estuary
  • Freshwater
  • Mangrove
  • Mud
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • Data
  • Data
  • 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 + 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
  • Data deficient
  • Listed
  • Not listed
Length Max
  • 33
Depth Range Min
  • 0
Depth Range Max
  • 10