Species: Centropomus unionensis, Hump-back snook, Union snook
large fish - nape humped
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.
High Resolution Map Download
- Salinity
-
- Marine
- Freshwater
- Brackish
- Inshore/Offshore
-
- Inshore
- Inshore Only
- Water Column Position
-
- Water column only
- Near Bottom
- Habitat
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- 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
- Diet
-
- 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
- Residency
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- Resident
- Climate Zone
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- Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
- South Temperate (Peruvian Province )
- Northern Subtropical (Cortez Province + Sinaloan Gap)
- IUCN Red List
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- Least concern
- Listed
- CITES
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- Not listed
- Length Max
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- 36.6
- Depth Range Min
-
- 0
- Depth Range Max
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- 25
