Shorefishes of the Eastern Pacific online information system

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Species: Bathygobius lineatus, Southern frillfin

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3 dark spots after eye - 3rd large
D1; striped, outer part clear
head with white spots
pectoral: free rays - 1 branch

Bathygobius lineatus (Jenyns, 1842)

Southern frillfin

Body robust; head broad, depressed; snout bluntly rounded; eyes large, close together; mouth moderate sized, relatively horizontal; tongue with distinct notch in front; jaw teeth in bands, without canines; dorsal fins VI + I, 9 rays; anal I, 8 rays; pelvic disc elipticalm sometimes reaching to anus, its front membrane with small side lobes; tail round, 25-32 rays; pectoral rays 19-21, the uppermost 5 rays forming free filaments, 1st  to 4th  branch only once; scales large, rough, 30-37 on mid side, predorsal scales not reaching eyes, rest of head scaleless (B. l. arundelii sometimes with scales on opercle).

Light brown with several diffuse brown saddles across back; a clearly defined midlateral longitudinal row of alternating dark brown and white blotches; lower portion of head dark brown with scattered white spots; 1st dorsal fin with a clear outer edge and dark inner stripes, innermost ones darkest at rear; last of three dark blotches behind eye is much larger than 1st.

Size: to about 12 cm.

Inhabits rocky shores, common in tide pools.

Depth: 0-2 m.

An island species found at Clipperton, the Galapagos Islands, Gorgona Is and Lobos de Afuera in northern Peru.

Note: Miller et al 2001 recognized a different subspecies at each of these three localities (but did not examine specimens from Gorgona) -B. lineatus arundelii, B. l. lineatus and B. l. lupinus, respectively.

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  • Marine Only
  • Marine
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom
  • Bottom only
  • Reef only
  • Reef associated (reef + edges-water column & soft bottom)
  • Reef (rock/coral/oyster)
  • Rocks
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • No Data
  • No Data
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic worms
  • Mobile benthic gastropods/bivalves
Egg Type
  • Pelagic larva
  • No data
  • Benthic
Global Endemism
  • All species
  • Tropical Eastern Pacific (TEP) endemic
  • East Pacific endemic
Regional Endemism
  • Island (s) only
  • Multiple oceanic islands endemic
  • TEP oceanic island (s) endemic
  • TEP endemic
  • All species
  • Island (s)
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • South Temperate (Peruvian Province )
IUCN Red List
  • Listed
  • Vulnerable
  • Not listed
Length Max
  • 12
Depth Range Min
  • 0
Depth Range Max
  • 2