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Species: Hyporhamphus roberti, Slender Halfbeak

All Families:   All Genera:   All Species:

gill rakers > 38
scales on D & A: absent/few at front

Hyporhamphus roberti (Valenciennes in Cuvier & Valenciennes, 1847)

Slender Halfbeak

Elongate and slender; no teeth; lower jaw extended into a long beak, with fleshy tip; upper jaw short, triangular, covered with scales; nostrils in a pit before eye; well developed ridge just before eye; gill rakers usually >38; dorsal rays 14-16; anal rays 15-17, fin origin under dorsal fin origin; pectoral rays 11-12 (usually 11), fin relatively short, not reaching nostril when folded forward; tail fin concave; dorsal and anal fins without scales, or only a few present at front of fins.

Greenish on back, silvery white below; flank with grey stripe, bordered above by a black line; back with 3 black lines; lower jaw with red tip; tail clear, with dark border.

Size: reaches 21 cm.

Habitat: estuaries and river mouths.

Depth: 0-30 m.

SW Gulf of Mexico to southern Brazil. Two subspecies recognized: H. r. hildebrandi from Belize to the Gulf of Urraba, Colombia; H. r. roberti from Lake Maracaibo (Venezuela) to Brazil.

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  • Brackish
  • Freshwater
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Near Surface
  • Surface
  • Water column only
  • Water column
  • Estuary
  • Flotsam
  • Freshwater
  • Reef associated (reef + edges-water column & soft bottom)
FishBase Habitat
  • Pelagic
  • Reef Associated
Feeding Group
  • Data
  • Omnivore
  • Planktivore
  • Data
  • Zooplankton
  • Benthic microalgae
  • Bony fishes
Egg Type
  • Benthic
  • Data
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean non-endemic
  • West Atlantic Endemic
Regional Endemism
  • Also in Brazil
  • Continent
  • Continent only
  • Extends South of GC
  • GC non-endemic
  • All species
  • Resident
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
  • Tropical (10-23N, Nicaragua / Cuba)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 21
Depth Range Min
  • 0
Depth Range Max
  • 30