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Species: Dorosoma petenense, Threadfin Shad

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snout pointed, not overhanging mouth
black shoulder spot
A 17-25
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, 17-25 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: lives in rivers and freshwater lakes; also found in estuaries.

Depth: 0-10 m.

The SE USA, through the Gulf of Mexico south to Guatemala.

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  • Brackish
  • Freshwater
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Near Surface
  • Surface
  • Water column only
  • Water column
  • Estuary
  • Freshwater
FishBase Habitat
  • Pelagic
Feeding Group
  • Carnivore
  • Data
  • Planktivore
  • Data
  • Zooplankton
  • Bony fishes
  • Phytoplankton
Egg Type
  • Benthic
  • Data
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean endemic
  • West Atlantic Endemic
Regional Endemism
  • Continent
  • Continent only
  • GC endemic
  • All species
  • Resident
Climate Zone
  • Subtropical (23-35N, Florida / Carolinas / Bermuda)
  • Tropical (10-23N, Nicaragua / Cuba)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 23
Depth Range Min
  • 0
Depth Range Max
  • 10