Shorefishes of the Eastern Pacific online information system

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Species: Neoopisthopterus tropicus, Tropical longfin-herring

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mouth opens at front
D tip and top tip C: blackish
top jaw: short, 2 toothed, close-set bones
belly - keel of scutes
no pelvics
A long base, 43-48

Neoopisthopterus tropicus (Hildebrand, 1946)

Tropical longfin-herring

Small, elongate, slender, its depth about 3.8-4.0 in SL, compressed;  mouth opens at front, oblique; top jaw short, not reaching beyond rear edge of eye; jaw teeth few, very small; top jaw with 2 toothed bones, no gap between them; gill rakers short, thick, few; dorsal fin 13-15, its origin well behind mid-body, behind anal fin origin; no pelvics; anal fin base long (43-48 rays); a sharp keel of ~ 26 scutes along belly.

Greenish brown on back, silvery white below with a silver mid-lateral band; tip of dorsal and top of tail blackish .

Size: grows to 11 cm.

Habitat: forms large schools in bays, estuaries, and in brackish river mouths.

Depth: 0-10 m?

The SE Gulf of California to northern Peru.

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  • Marine
  • Brackish
  • Inshore Only
  • Inshore
Water Column Position
  • Surface
  • Near Surface
  • Water column only
  • Freshwater
  • Estuary
  • Water column
FishBase Habitat
  • Pelagic
Feeding Group
  • Data
  • Planktivore
  • Zooplankton
  • Pelagic fish eggs
  • No Data
  • Pelagic fish larvae
Egg Type
  • No data
  • Pelagic
  • Pelagic larva
Global Endemism
  • East Pacific endemic
  • Tropical Eastern Pacific (TEP) endemic
  • All species
Regional Endemism
  • 3 provinces (Cortez + Mexican + Panamic) endemic
  • Continent
  • Continental TEP endemic
  • Continent only
  • TEP endemic
  • All species
  • Resident
Climate Zone
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 11
Depth Range Min
  • 0
Depth Range Max
  • 10