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Species: Gobiomorus dormitor, Bigmouth Sleeper

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head elongate, cónical, scaled
large mouth, lower jaw strongly projects
pectoral 17
body scales rough
lateral scales 55-64

Gobiomorus dormitor Lacepede, 1800

Bigmouth Sleeper

Body elongate, cylindrical, narrowing to rear; head elongate, conical in profile, depressed above; mouth large, lower jaw projecting; teeth small conical, in several rows on jaws; teeth on front of roof of mouth; gill openings extend forward nearly to the level of the angles of the mouth, separated from each other by a very narrow isthmus; gill membranes with 6 rays; gill rakers 16 (14-17); dorsal fins VI weak spines + I, 9, fins well separated, base of 2nd dorsal < distance from the end of that base to tail fin; anal fin I, 9 (rarely 8 or 10); pectoral 17 (16-17), broad and fan like; pelvic fins I, 5, long, completely and widely separated; tail fin rounded, with 14 (rarely 13 or 15) principal rays; scales rough on body, smooth on head, medium sized, 56-58 (55-64) in lateral series, on body, forehead, cheeks and operculum; no lateral line; 1/4-1/3 of base base of pectoral fin scaled.

Dark brown to olive brown above and tan to yellowish tan below; several faint dark stripes on operculum; an oblique blackish bar across rear 1/2 of 1st dorsal; rows of spots on 2nd dorsal and tail fins; juveniles with more intense colors; a black stripe formed by a series of blotches from snout, through the eye to the base of the tail fin; tail fin base with 3 black spots, in the center and top and bottom profiles.

Reaches: 60.0 cm TL.

Habitat: freshwater; brackish; marine; adults occur in fresh water, often well inland. Inhabits larger free flowing clear water streams.

Depth: 0-5 m.

Both sides of the Atlantic; Bermuda to Brazil.

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  • Brackish
  • Freshwater
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Sand & gravel
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Soft bottom only
  • Submerged vegetation
  • Estuary
  • Freshwater
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • Data
  • Data
  • Bony fishes
  • Insects
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic gastropods/bivalves
Egg Type
  • Benthic
  • Data
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean non-endemic
  • Transatlantic (East+West Atlantic)
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
  • 60
Depth Range Min
  • 0
Depth Range Max
  • 5