Shorefishes of the Eastern Pacific online information system

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Species: Gobiosoma aceras, White-margined goby

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both sexes: 7 wide dark bars
D2 I, 13
scales: mainly rough, 32-55 lateral, to pectoral base
barbels: chin 2, nostril 1

Gobiosoma aceras Ginsburg, 1939

White-margined Goby

Head round; a pair of joined barbels under chin, 1 prominent barbel under front nostril; pore between front edges of eyes, 2 pores above opercle, pores on preopercle; both nostrils tubular; teeth in bands, with some canines, none on sides of roof of mouth; tongue with round tip; gill opening restricted to vertical opening as long as width of pectoral fin base; dorsal fin VII + I, 13, long based; anal I, 10; pelvics fused in disc with smooth front edge; tail round, with 17 segmented rays; scales small (32-55 along side), mainly rough, extend forwards to just behind inner pectoral base; 2 very rough scales at base of tail fin; head, breast & belly scaleless.

Whitish; about 3 dark lines radiate down from eye; dark bar across nape;body with ~ 5 wide blackish bars that extend onto the dorsal fin (2 on 1st dorsal, 3 on the 2nd), with intervening narrow bars; tail fin with a broad black bar at its base, 2 faint outer bars; both sexes similarly colored.

Size: 4.6 cm.

Habitat: estuarine, rocky and mangrove tidepool; rock, shell and mud bottoms.

Depth: 0-10 m.

El Salvador to Panama.

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  • Marine
  • Brackish
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom only
  • Bottom
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Soft bottom only
  • Sand & gravel
  • Mud
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • No Data
  • No Data
  • Mobile benthic gastropods/bivalves
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic worms
Egg Type
  • No data
  • Benthic
  • Pelagic larva
Global Endemism
  • East Pacific endemic
  • Tropical Eastern Pacific (TEP) endemic
  • All species
Regional Endemism
  • Panamic province endemic
  • All species
  • Continent
  • TEP endemic
  • Continental TEP endemic
  • Continent only
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
IUCN Red List
  • Data deficient
  • Listed
  • Not listed
Length Max
  • 4.6
Depth Range Min
  • 0
Depth Range Max
  • 10