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Species: Rhonciscus crocro, Burro grunt

All Families:   All Genera:   All Species:

body speckled
D XIII, 11-13
A 2nd spine long, thick
D: no scales on membranes
16 rows scales under LL

Rhonciscus crocro (Cuvier in Cuvier & Valenciennes, 1830)

Burro grunt

Body elongate, robust, (depth 29-36% of SL), strongly compressed; 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; scales in longitudinal series just above lateral-line 53-55; 5-6 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 uniform dusky.

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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Salinity
  • Marine
  • Brackish
  • Freshwater
Inshore/Offshore
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
Habitat
  • Mud
  • Submerged vegetation
  • Mangrove
  • Sand & gravel
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Estuary
  • Soft bottom only
  • Freshwater
FishBase Habitat
  • Demersal
Feeding Group
  • Data
  • Carnivore
Diet
  • Mobile benthic crustacea (shrimps/crabs)
  • Bony fishes
Egg Type
  • Pelagic larva
  • Pelagic
  • No data
Global Endemism
  • West Atlantic Endemic
  • Greater Caribbean non-endemic
Regional Endemism
  • Continent
  • Continent + Island (s)
  • Island (s)
  • Also in Brazil
  • Extends South of GC
  • GC non-endemic
Residency
  • Resident
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
  • Tropical (10-23N, Nicaragua / Cuba)
  • Subtropical (23-35N, Florida / Carolinas / Bermuda)
IUCN Red List
  • Not evaluated / Listed
CITES
  • Not listed
Length Max
  • 33
Depth Range Min
  • 0
Depth Range Max
  • 10