Shorefishes of the Eastern Pacific online information system

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Species: Bollmannia macropoma, Frailscale goby, Large-eye goby

All Families:   All Genera:   All Species:

D1: faint dark blotch at base, spines long
flank: 3-6 bars
C base: ~ faint spot
top lip: black line

Bollmannia macropoma Gilbert, 1892

Frailscale goby, Large-eye goby

Head & body compressed; body relatively slender (greatest depth 18-22% of SL); head rounded, elongate (27-32% of SL); eye large, 8-10% of SL; mouth large, very oblique; teeth in several rows; dorsal fin VII (slightly filamentous, longest (5th) reaching 4th-5th  ray) + I, 13-14; anal I, 13-15; last rays of dorsal & anal reach base of tail fin; pectoral rays 24-26, reaches beyond origin of anal fin; pelvics fused to form disc, front margin of disc scalloped, reaches anus; tail base slender (least depth 8-9.5% of SL, < eye diameter); tail fin long (~ 50% of SL), strongly pointed; scales large (25-28 rows along body), rough; 7-9 scales before dorsal fin; 1-2 medium scales on upper ½ of opercle, several on upper ½ & 1-2 small ones on lower half of preopercle; 5-6 medium to large scales on base of pectoral fin.

Color (preserved fish): Body brownish, with 3-6 dusky vertical bars on side; 1st  dorsal with a large black spot on last ½ of its base; with or without faint spot on tail base; snout dusky, prominent black line on top lip; lower gill membranes, pelvics, soft dorsal & anal fins dusky.

Size: 13 cm

Habitat: benthic on soft bottoms.

Depth: 90-255 m.

The mouth fo theGulf of California;  Costa Rica; the Galapagos.

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  • Marine Only
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom only
  • Bottom
  • Soft bottom only
  • Sand & gravel
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Mud
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • No Data
  • Planktivore
  • Mobile benthic worms
  • Mobile benthic crustacea (shrimps/crabs)
  • No Data
Egg Type
  • No data
  • Pelagic larva
  • Benthic
Global Endemism
  • East Pacific endemic
  • Tropical Eastern Pacific (TEP) endemic
  • All species
Regional Endemism
  • Continent
  • All species
  • Continent + Island (s)
  • TEP endemic
  • Island (s)
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
IUCN Red List
  • Data deficient
  • Listed
  • Not listed
Length Max
  • 13
Depth Range Min
  • 90
Depth Range Max
  • 255