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Species: Centropomus unionensis, Hump-back snook, Union snook

All Families:   All Genera:   All Species:

head profile concave
large fish - nape humped
D1: 3rd spine ~ 4th, black blotch
LL: clear
A: 2nd spine thick, longest, almost to C

Centropomus unionensis Bocourt, 1868

Hump-back snook, Union snook

Body oblong elongate, compressed; upper head profile distinctly concave, pronounced hump on nape in adult; mouth large and protractile, lower jaw protruding; margin of preopercle serrated; gill rakers 22-24; dorsal rays VIII + I, 9 (occasionally 10), 3rd  dorsal spine ~ equal to 4th; anal rays III, 6 (rarely 5), second anal spine much stouter than third spine and slightly longer, also exceeding longest anal soft ray, almost reaching to tail fin; pelvics insert a little behind pectoral base, with I strong spine and 5 rays; pectoral rays 15-17 (usually 16); lateral-line scales 46-52 (usually 48-51); scales around tail base 22-25 (usually 23-24).

Generally silvery with yellowish hue on head; lateral line clear; pectoral and anal fins yellowish; anal fin with dark membrane between 2nd & 3rd spines; first dorsal fin with black blotch at tip.

Size: attains at least 36.6 cm.

Inhabits bays, estuaries, and lower reaches of freshwater streams.

Depth: 0-25 m.

The SE Gulf of California to Peru.

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  • Marine
  • Freshwater
  • Brackish
  • Inshore
  • Inshore Only
Water Column Position
  • Water column only
  • Near Bottom
  • Sand & gravel
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Water column
  • Mangrove
  • Soft bottom only
  • Beach
  • Estuary
  • Freshwater
  • Mud
FishBase Habitat
  • Demersal
Feeding Group
  • Data
  • Carnivore
  • No Data
  • Mobile benthic crustacea (shrimps/crabs)
  • Bony fishes
Egg Type
  • Pelagic larva
  • No data
  • Pelagic
Global Endemism
  • All species
  • East Pacific endemic
  • Tropical Eastern Pacific (TEP) endemic
Regional Endemism
  • TEP endemic
  • Continent
  • 3 provinces (Cortez + Mexican + Panamic) endemic
  • All species
  • Continental TEP endemic
  • Continent only
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • South Temperate (Peruvian Province )
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 36.6
Depth Range Min
  • 0
Depth Range Max
  • 25