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Species: Genyatremus scapularis, Peruvian grunt

All Families:   All Genera:   All Species:

dark grey, LL silver
D & A: front rays longest - > triangular fin

Genyatremus scapularis (Tschudi, 1845)

Peruvian grunt

Body deep, compressed, back high; head small, blunt, a conspicuous depression before eye; rear margin of bone under eye concealed by scales; mouth small, low, ~horizontal, lips thick;  teeth in bands on jaws, outer ones larger, conical; chin  with 2 pores, with a central groove; preopercle finely serrated, but no enlarged spines; dorsal continuous, but not deeply notched, XII, 14-17; anal III, 12-13, 2nd  spine long and thick;  longest dorsal spine and 2nd  anal spine  ½ head length;  anterior rays of dorsal and anal fin much taller than posterior rays, giving these fins a somewhat triangular outline; pectoral fins relatively short, not reaching anal origin; tail forked; scales small, in oblique rows above, horizontal rows below; scales over entire body and head except front of snout, lips and chin; soft dorsal and anal without scales; lines of scales above lateral line in rows oblique to that line.

Dark charcoal grey to brownish on upper half, white below; a silvery-white streak along lateral line (rapidly fades after death).

Size: grows to 40 cm.

Habitat: forms large schools on rocky reefs.

Depth: 5-30 m.

Galapagos Islands, Malpelo, Cocos, northern Peru to Chile.

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  • Marine Only
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom + water column
  • Near Bottom
  • Bottom
  • Reef only
  • Reef associated (reef + edges-water column & soft bottom)
  • Rocks
  • Water column
  • Reef (rock/coral/oyster)
FishBase Habitat
  • Reef Associated
Feeding Group
  • Data
  • Omnivore
  • Benthic macroalgae/seagrasses
  • Bony fishes
  • Data
  • Mobile benthic gastropods/bivalves
  • Mobile benthic worms
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • No data
  • Pelagic
  • Pelagic larva
Global Endemism
  • All species
  • East Pacific endemic
  • TEP non-endemic
Regional Endemism
  • Island (s)
  • Continent + Island (s)
  • Peruvian province, primarily
  • Tropical Eastern Pacific (TEP) non-endemic
  • Continent
  • Temperate Eastern Pacific, primarily
  • All species
  • Vagrant
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • South Temperate (Peruvian Province )
IUCN Red List
  • Listed
  • Least concern
  • Not listed
Length Max
  • 40
Depth Range Min
  • 5
Depth Range Max
  • 30