Shorefishes of the Eastern Pacific online information system

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Species: Bollmannia marginalis, Apostrophe goby, Margin-spot goby

All Families:   All Genera:   All Species:

D1: black blotch rear center
D2 stripe + spots
flank: 5-6 double dark bars
C base - black spot
top lip: without black line

Bollmannia marginalis Ginsburg, 1939

Apostrophe Goby, Margin-spot Goby

Head & body compressed; body relatively slender (greatest depth 17-22.5% of SL); head rounded, elongate (25-33% of SL); eye large, 7-9% of SL; mouth large, very oblique; teeth in several rows; dorsal fin VII (spines very elongate, filamentous, often reaching tail fin base, 1st & 2nd spines longest in female, 5th longest in male) + I, 13-15; anal I, 13-15; last rays of dorsal & anal reach base of tail fin; pectoral rays 23-25, reaches beyond origin of anal fin; pelvics fused to form disc, front margin of disc scalloped, reaches anus; tail base slender (least depth 8-10.5% of SL); tail fin long (~ 30% of SL), strongly pointed; scales large (25-28 rows along body), rough; 7-9 scales before dorsal fin; no scales on lower cheek, upper third of opercle covered with large scales; 1 large + 4-5 small scales on base of pectoral fin.

Body brownish, with orange spots; orange lines on head; a median row of 5-6 short double dark bars from behind head to tail fin base; 1st dorsal with a black spot at the center rear; 2nd dorsal with 2 rows of orange spots, separated by an orange stripe; no black band on upper lip; anal fin dusky, with orange spots; tail fin with orange spots, a black spot at its base; pelvic dark.

Size: 5.7 cm.

Habitat: benthic on soft bottoms.

Depth: 15-80 m.

Southern Gulf of California to Ecuador.

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  • Marine Only
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom only
  • Bottom
  • Mud
  • Soft bottom only
  • Sand & gravel
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • No Data
  • Planktivore
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic worms
  • No Data
Egg Type
  • Pelagic larva
  • Benthic
  • No data
Global Endemism
  • East Pacific endemic
  • All species
  • Tropical Eastern Pacific (TEP) endemic
Regional Endemism
  • 3 provinces (Cortez + Mexican + Panamic) endemic
  • All species
  • Continent
  • Continental TEP endemic
  • TEP endemic
  • Continent only
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
IUCN Red List
  • Listed
  • Data deficient
  • Not listed
Length Max
  • 5.7
Depth Range Min
  • 15
Depth Range Max
  • 80