Shorefishes of the Eastern Pacific online information system

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Species: Gobiosoma seminudum, Silt goby, Tidal goby

All Families:   All Genera:   All Species:

male: dark, Ds - white edges
dark + irregular oblique white bars
D2 I, 13-14
scales smooth, 33-59, to pectoral base
barbels: chin 2, nostril 1, snout 2
male all dark, D1 white edge

Gobiosoma seminudum (Günther, 1861)

Silt Goby, Tidal Goby

Body robust; head broader than deep, cheeks swollen; a pair of thick barbels under chin, 1 prominent barbel under front nostril, a pair of barbells at tip of snout; 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, 13-14, 2nd long based, low membrane joins two fins; anal I, 9-11; pelvics fused in disc that has smooth front edge; tail round, with 17 segmented rays; scales small (33-59 along side), smooth, present behind level of inner pectoral base; 2 very rough scales at base of tail fin; head, breast & belly scaleless.

Dark grey, with ~ 4 irregular wide, oblique white bars and spots on body; a series of dark dashes along mid-flank ;white blotch on the pectoral base, with a dark crescent at the base of the fin; head with pale bars under and before eye, and a pale bar back from eye; first dorsal blackish, with white spots on base; second dorsal with ~ 3 dark stripes and a dark margin; tail fin with ~ 4 blackish bars. Male can be all brown, with white submarginal stripes on the dorsal fins.

Size: 4.5 cm.

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

Depth: 0-5 m.

E Gulf of California to Colombia.

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  • Brackish
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom only
  • Bottom
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Soft bottom only
  • Mud
  • Sand & gravel
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • No Data
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic gastropods/bivalves
  • No Data
  • Mobile benthic worms
Egg Type
  • No data
  • Pelagic larva
  • Benthic
Global Endemism
  • East Pacific endemic
  • Tropical Eastern Pacific (TEP) endemic
  • All species
Regional Endemism
  • Continental TEP endemic
  • Continent
  • 3 provinces (Cortez + Mexican + Panamic) endemic
  • All species
  • TEP endemic
  • Continent only
  • Resident
Climate Zone
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
IUCN Red List
  • Not evaluated / Listed
  • Not listed
Depth Range Min
  • 0
Depth Range Max
  • 5
Length Max
  • 4.5