Shorefishes of the Greater Caribbean online information system

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Species: Awaous flavus, Redfin River Goby

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5+2 pores on discontinuous canal behind eye
D1 red/orange
bar under D1 origin - straight
scales 57-58 laterals, 20 before D



Awaous flavus (Valenciennes, 1837)

Redfin River Goby

Head broad, depressed; snout blunt; head and body flattened on bottom; eyes small, close together, a pair of pores above front margin; pores in two series of 5 anterior and 2 posterior on a discontinuous canal behind eye; mouth a little under snout; jaw teeth slender, long, none on front of roof of mouth; 2-3 elongate papillae on shoulder girdle under gill cover; gill membranes broadly joined to body under throat, with 5 rays; dorsal fin VI + I, (8-11); length of 2nd dorsal base > distance from 2nd dorsal base to tail fin; anal fin 10 (9-11); pectoral fin 16 (15-17); pelvic fins fused into a disk; tail fin rounded; scales on entire body, rough; scales in lateral series 57-58 (51-60); scales before dorsal fin 20 (17-25); no lateral line.

Color: pale grey brown; 6-8 distinct narrow dark vertical bars on body from behind pectoral fin base to tail base, the bar under the origin of the 1st dorsal straight; first dorsal fin red to reddish orange, especially prominent in males.

Reaches: 11 cm.

Depth range: 0.3-5 m.

Habitat: Usually reported from estuaries and river deltas over sand and mud bottoms, seldom in water of much flow and has never been reported in freshwater above tidal influence.

E Venezuela to Brazil.

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  • Brackish
  • Freshwater
  • Non Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Sand & gravel
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Soft bottom only
  • Estuary
  • Freshwater
  • Mud
FishBase Habitat
  • Demersal
Feeding Group
  • Data
  • Omnivore
  • Data
  • Benthic microalgae
  • Insects
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic worms
Egg Type
  • Benthic
  • Data
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean non-endemic
  • West Atlantic Endemic
Regional Endemism
  • Also in Brazil
  • Continent
  • Continent only
  • Extends South of GC
  • GC non-endemic
  • All species
  • Resident
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 11
Depth Range Min
  • 0
Depth Range Max
  • 5