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Species: Rhonciscus pauco, Opalescent Grunt

All Families:   All Genera:   All Species:

silver + gold speckling
eye large, orange
D XIII, 12
A 2nd spine long, thick
preopercle: 2-3 large spines at angle
LL 48-50
7 rows scales above LL

Rhonciscus pauco Tavera, Scharer & Acero, 2022

Opalescent Grunt

Elongate (depth 32-37.4% SL), strongly compressed; upper head profile convex; eye relatively large, 9.4-10.4%of SL; mouth moderate oblique, opens at front, strongly protrusible, inside not red, lips thin; chin with 2 pores at front and 2 inside hole behind, plus a longitudinal groove; gill rakers 16 (5+11); preopercle coarsely serrated, 2-3 large spines at corner, 20-21 small spines on vertical edge; tail base long (15.2-20% SL); dorsal fin XIII, 12, last two spines relatively long, so fin is moderately notched; anal III, 7, second anal spine very long and stout; pectoral fins relatively long (28-32.5% SL), passing tips of depressed pelvic fins; pelvic fin with filament on first ray; no scales on soft dorsal and anal fins; 48-50 pored lateral line scales; 7 oblique rows of scales between lateral line and origin of dorsal fin.

Opalescent silver with golden speckling; eye orange; some of scales on back, particularly at rear of body, with a black dot at base; fins translucent; outer edge of spinous dorsal membrane black; trailing edge of caudal fin with black dots.

Size: grows to at least 30.5 cm.

Inhabits deep soft bottoms.

Depth: 200-360 m.

Known only from western Puerto Rico.

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  • Marine
  • Marine Only
  • In & Offshore
  • Inshore
  • Offshore
Water Column Position
  • Bottom
  • Bottom only
  • Sand & gravel
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Soft bottom only
  • Mud
FishBase Habitat
  • Bathydemersal
Feeding Group
  • Carnivore
  • No Data
  • Data
  • Bony fishes
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • No data
  • Pelagic
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean endemic
  • West Atlantic Endemic
Regional Endemism
  • Antilles endemic
  • Caribbean endemic
  • Island (s)
  • Island (s) only
  • All species
  • Resident
Climate Zone
  • Subtropical (23-35N, Florida / Carolinas / Bermuda)
IUCN Red List
  • Not evaluated / Listed
  • Not listed
Length Max
  • 30.5
Depth Range Min
  • 200
Depth Range Max
  • 360