Shorefishes of the Eastern Pacific online information system

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Species: Opisthopterus macrops, Bigeye longfin-herring

All Families:   All Genera:   All Species:

deep body; concave nape
large eye
D origin center C to pectoral base
dark spot after operculum
fins yellow
lower gill rakers 19-20
A: ~ 60, origin nearer snout tip than C

Opisthopterus macrops (Günther, 1867)

Bigeye longfin-herring

Body elongate, strongly compressed; eye very large; mouth opens obliquely up, lower jaw projecting at front, short (ends under eye); distinct space between 2 bones of top jaw; jaw teeth small; 19-20  lower gill rakers; dorsal fin 11, small, origin midway between tail fin and pectoral base; anal fin long (~60 rays), origin nearer tip of snout than base of tail fin;  pelvic fins absent; belly with a sharp keel of ~29 large spiny scales (scutes); ~ 45-60 lateral scales.

Silvery; a dark blotch behind upper corner of operculum; fins yellowish.

Size: 21 cm.

Habitat: marine, coastal.

Depth: 0-10 m?

El Salvador to Ecuador.

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  • Marine Only
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Surface
  • Water column only
  • Near Surface
  • Water column
FishBase Habitat
  • Pelagic
Feeding Group
  • Carnivore
  • Planktivore
  • No Data
  • Pelagic fish larvae
  • No Data
  • Zooplankton
  • Pelagic fish eggs
  • Bony fishes
Egg Type
  • Pelagic
  • No data
  • Pelagic larva
Global Endemism
  • East Pacific endemic
  • All species
  • Tropical Eastern Pacific (TEP) endemic
Regional Endemism
  • All species
  • Continental TEP endemic
  • Panamic province endemic
  • TEP endemic
  • Continent only
  • Continent
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 21
Depth Range Min
  • 0
Depth Range Max
  • 10