Shorefishes of the Greater Caribbean online information system

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Species: Gobiosoma grosvenori, Rockcut goby

All Families:   All Genera:   All Species:

head somewhat depressed
pores: opercle 2, preopercle 3
D2 I,9; A 8; pectoral 17
9 broad dark bars with dark central dashes
pelvics almost separate
lateral scales 31-35, no scales above & below band forward to pectoral base

Gobiosoma grosvenori (Robins, 1964)

Rockcut goby

Body robust; head rounded, broader than deep, somewhat depressed; snout blunt; anterior nostril a short tube, posterior a raised rim; 1 pore between eyes; 2 pores over opercle; 3 preopercular pores;mouth small, a little under snout; upper lip separated from snout by a groove along its top edge; teeth in 4 rows in upper jaw, 3 in lower jaw, outer row of teeth enlarged in upper and lower; no teeth on roof of mouth; tongue truncate to slightly bilobed; gill membranes broadly joined to body under throat, with 5 rays; dorsal fin VII (none  filamentous) + I, 9; length of 2nd dorsal base > distance from 2nd dorsal base to tail fin; anal fin I, 8 (7-8); pectoral fin 17 (16-18) elongate reaching to origin of 2nd dorsal fin; pelvic I, 5, fins almost completely separate, shape elongate, anterior membrane of fin very small, fin extends ¾ distance to anus; caudal fin segmented 17, rounded; scaled from tail fin base to pectoral fin, with a narrow tongue of scales on the front body; upper narrow naked area from upper pectoral fin base to origin of second dorsal fin; lower narrow naked area from lower pectoral fin base to anal-fin origin; four very rough scales at base of tail fin; scales in longitudinal series 31-35; scales easily shed; no lateral line.

Tan; mid-side with 9 dark bars from the tail fin to the base of the pectoral fin, a row of dark dashes in centers of the dark bars along the flank center; narrow whitish interspaces between those bars; pectoral fin base covered by scattered dark spots, some concentrated in a poorly organized spot on upper fin base; pelvic fin with numerous spots; base of the gill membrane black, forming a broad dark "V" or "Y" on the throat; anal fin with a broad dark stripe; tail- and dorsal fins unmarked or without a consistent pattern.

Size: 3.0 cm.

Habitat - Found in open shallow shore waters with scattered coral, rubble, rocks, open sandy areas and weed beds.

Depth range: 1-5 m.

Florida to the S Caribbean.

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  • Marine
  • Brackish
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom
  • Sand & gravel
  • Reef (rock/coral/oyster)
  • Submerged vegetation
  • Reef associated (reef + edges-water column & soft bottom)
  • Estuary
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Reef and soft bottom
  • Rocks
FishBase Habitat
  • Reef Associated
Feeding Group
  • Carnivore
  • Data
  • Mobile benthic worms
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic gastropods/bivalves
  • Data
Egg Type
  • Data
  • Benthic
  • Pelagic larva
Global Endemism
  • All species.
  • West Atlantic Endemic
  • Greater Caribbean endemic
Regional Endemism
  • Continent
  • GC endemic
  • Continent + Island (s)
  • All species..
  • Island (s)
  • Resident
Climate Zone
  • Tropical (10-23N, Nicaragua / Cuba)
  • Equatorial (0-10N, Costa Rica / Venezuela)
  • Subtropical (23-35N, Florida / Carolinas / Bermuda)
IUCN Red List
  • Listed
  • Least concern
  • Not listed
Length Max
  • 3
Depth Range Min
  • 1
Depth Range Max
  • 5