Shorefishes of the Eastern Pacific online information system

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Species: Dorosoma petenense, Threadfin shad

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snout opens at front
notch between top jaws
D: last ray filamentous
black spot on shoulder
lower jaws; sides curved outwards
belly keel of scutes
A 17-27
lateral scales 41-48

Dorosoma petenense (Günther, 1867)

Threadfin shad

Body deep, compressed; snout pointed, not bulging out past mouth at front; mouth small, at front, with notch between front of upper jaws; sides of lower jaw curved in below when viewed from front; last dorsal fin ray long, filamentous; anal fin short, 17-27 rays, origin just behind base of dorsal fin; pelvic fins on the abdomen below the dorsal fin, i, 7; a forked tail fin; scales large, regularly arranged, in 41-48 lateral rows; ventral profile a strongly convex keel of scutes.

Grey-brown to blue-black above; sides silver; a black spot a little behind upper edge of operculum.

Size: 23 cm.

Habitat: common in mouths of rivers; lives in rivers and freshwater lakes.

Depth: 0-10 m.

A northwest Atlantic species introduced into rivers of the NE Gulf of California.

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  • Brackish
  • Freshwater
  • Marine
  • Inshore Only
  • Inshore
Water Column Position
  • Surface
  • Near Surface
  • Water column only
  • Freshwater
  • Water column
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Estuary
FishBase Habitat
  • Pelagic
Feeding Group
  • Data
  • Planktivore
  • Zooplankton
  • Pelagic fish larvae
  • Pelagic fish eggs
  • Data
  • Phytoplankton
Egg Type
  • Pelagic
  • No data
  • Pelagic larva
Global Endemism
  • TEP non-endemic
  • All species
  • Exotic (Introduced)
Regional Endemism
  • Continent
  • All species
  • Continent only
  • Tropical Eastern Pacific (TEP) non-endemic
  • Eastern Pacific non-endemic
  • Resident
Climate Zone
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
  • North Temperate (Californian Province &/or Northern Gulf of California)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 23
Depth Range Min
  • 0
Depth Range Max
  • 10