Shorefishes of the Eastern Pacific online information system

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Species: Aruma histrio, Slow goby

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head flattened, cheeks puffy
brown + thin white bars
preopercle with barbel
pectoral base - black & white bars



Aruma histrio (Jordan, 1884)

Slow goby

Body elongate, somewhat compressed; head large, flattened, with puffy cheeks; mouth large, oblique; tip of tongue notched; pore between middle of eyes but none in front of eyes; preopercle with 2 pores & 1 small barbel on its edge, no other barbels on head;  dorsal fin VII + I, 11-12; anal rays I, 9-12; pectoral rays 17-20 (rarely 16); pelvics fused to form disc; tail long, rounded; no scales; no lateral line.

Brown with 6-7 white bars, these sometimes incomplete or posterior 1-4 bars weak or missing; a narrow white bar at pectoral fin base followed by a dark brown bar; fins dusky brown to whitish.

Size: attains 6.5 cm.

Habitat: a secretive species that inhabits rocky crevices in tide pools and under cobble in shallow water.

Depth: to at least 15 m.

Endemic to Gulf of California.

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  • Marine Only
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Bottom only
  • Reef associated (reef + edges-water column & soft bottom)
  • Reef only
  • Reef (rock/coral/oyster)
  • Rocks
FishBase Habitat
  • Demersal
Feeding Group
  • No Data
  • Carnivore
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic worms
  • No Data
Egg Type
  • Benthic
  • No data
  • Pelagic larva
Global Endemism
  • All species
  • East Pacific endemic
  • Tropical Eastern Pacific (TEP) endemic
Regional Endemism
  • Cortez province endemic
  • Continental TEP endemic
  • All species
  • Continent only
  • TEP endemic
  • Continent
  • Resident
Climate Zone
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
  • North Temperate (Californian Province &/or Northern Gulf of California)
IUCN Red List
  • Listed
  • Least concern
  • Not listed
Length Max
  • 6.5
Depth Range Min
  • 0
Depth Range Max
  • 15