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Species: Bathygobius soporator, Frillfin Goby

All Families:   All Genera:   All Species:

nape scales to well before preopercle edge
D1 broad vertical/oblique bar
body: 3 saddles above + 6-7 flank blotches
C base- large, dark, irregular blotch
pectoral 18-21
lateral scales 38-44

Bathygobius soporator (Valenciennes, 1837)

Frillfin Goby

Body robust; head broad, depressed, with pores; snout bluntly rounded; eyes large, close together; mouth moderate sized, relatively horizontal; upper jaw length 11.9-13.7% SL; tongue with deep notch in front; jaw teeth in bands, without canines; gill membranes broadly joined to body under throat, with 5 rays; dorsal fins VI (none elongate) + I, 9 rays; length of 2nd dorsal base > distance from 2nd dorsal base to tail fin; anal I, 8 rays; pelvic fins fused into a disc; pectoral 20 (18-21), upper 3-5 rays free, silky threads; tail round; scales large, rough, 38-44 on mid-side, present on midline of nape to well before a line through rear edge of preopercle, often to level of rear edge of dark blotches behind eye; no scales on cheek or operculum; no lateral line.

Grayish brown; upper half of body with 3 prominent dark saddles, sometimes dividing at lower edge, lower tips often connecting to 6-7 large, dark irregular blotches along mid-flank that may extend down to bottom profile; 1st dorsal fin with a broad diagonal or vertical dark bar; 2nd dorsal fin with thin dark stripes and yellowish outer edge; tail fin with a large dark irregular blotch on its base and thin dark bars on its outer part.

Reaches 15 cm.

Depth: 0-16 m.

Habitat: Found in sheltered habitats on mixed sand bottom and turtle-grass beds with rocks, mangroves, the mouths of streams, Millepora reefs.

E & W Atlantic; Bermuda to Brazil.

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  • Brackish
  • Freshwater
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Bottom only
  • Rocks
  • Sand & gravel
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Sponges
  • Submerged vegetation
  • Freshwater
  • Reef (rock/coral/oyster)
  • Reef and soft bottom
  • Reef associated (reef + edges-water column & soft bottom)
FishBase Habitat
  • Demersal
  • Reef Associated
Feeding Group
  • Carnivore
  • Data
  • Data
  • Insects
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • Benthic
  • Data
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean non-endemic
  • West Atlantic Endemic
Regional Endemism
  • Also in Brazil
  • Continent
  • Continent + Island (s)
  • Extends N + S of GC
  • Extends North of GC
  • 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)
  • Temperate (>35N)
  • Tropical (10-23N, Nicaragua / Cuba)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 15
Depth Range Min
  • 0
Depth Range Max
  • 16