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Species: Chriodorus atherinoides, Hardhead Halfbeak

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lower jaw not elongate
19-23 gill rakers
pectoral short, 13-14



Chriodorus atherinoides Goode & Bean, 1882

Hardhead Halfbeak

Elongate slender; upper jaw is short and triangular, lower jaw not extended; gill rakers 19-23; fins without spines; dorsal and anal fins at rear of the body, with their bases about opposite one another, both raised at the front; dorsal fin 15-18, anal fin 15-17; pectoral fins high on the sides, behind upper corner of operculum, relatively short, usually 13-14; pelvic fins under the abdomen; tail fin moderately forked, symmetrical; lateral line low on the side of the body; scales large and smooth, 51-55 lateral rows.

Translucent greenish above, with dark dots on scales; silvery below; a bright silver stripe along flank, which is broadest under dorsal fin.

Reaches 20.6 cm.

Shallow freshwater, brackish and marine areas, including brackish lakes.

Depth range: 0-5 m.

Florida to the northern Caribbean.

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  • Brackish
  • Freshwater
  • Hypersaline
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Near Surface
  • Surface
  • Water column only
  • Water column
  • Estuary
  • Freshwater
FishBase Habitat
  • Pelagic
Feeding Group
  • Data
  • Omnivore
  • Planktivore
  • Data
  • Zooplankton
  • Benthic microalgae
Egg Type
  • Benthic
  • Data
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean endemic
  • West Atlantic Endemic
Regional Endemism
  • Continent
  • Continent + Island (s)
  • GC endemic
  • Island (s)
  • 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
  • 20.6
Depth Range Min
  • 0
Depth Range Max
  • 5