Shorefishes of the Eastern Pacific online information system

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Species: Alphestes immaculatus, Pacific hamlet, Pacific mutton-hamlet

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snout short, forehead straight
dark bars + white spots + black dots
pectoral: rows spots

Alphestes immaculatus Breder, 1936

Pacific mutton-hamlet, Pacific hamlet

Body deep, strongly compressed; large eyes; snout short; forhead with straight profile; preopercle serrated, with large forward-curving spine at lower front corner; 3-5 rows of small teeth on each jaw, a pair of small canines at front of both jaws, most of teeth movable; 21-24 gill rakers; dorsal with XI spines, 18 rays, with little or no notch between spiny and soft parts; anal fin III, 9; pectoral 17; tail rounded; flank scales smooth.

Rusty brown with darker brown blotches forming irregular bars on side; numerous dark brown and pale spots, and larger pale blotches on head and body; pectoral fins with rows of dark spots.

Size: reaches 30 cm.

Habitat: a secretive nocturnal predator found hiding in rocky crevices or amongst weed during the day.

Depth: 3-32 m.

Southern Baja and the Gulf of California to central Peru, the Revillagigedos, Galapagos, Malpelo and Cocos.

Closely related and sometimes confused with A. afer from the western Atlantic.

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Species Data Create Report Export as Word File Export as Excel File
  • Brackish
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom only
  • Bottom
  • Reef (rock/coral/oyster)
  • Reef only
  • Reef associated (reef + edges-water column & soft bottom)
  • Submerged vegetation
  • Rocks
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • Data
  • Data
  • Bony fishes
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • Pelagic larva
  • No data
  • Pelagic
Global Endemism
  • East Pacific endemic
  • All species
  • Tropical Eastern Pacific (TEP) endemic
Regional Endemism
  • All species
  • Island (s)
  • TEP endemic
  • Continent + Island (s)
  • Continent
  • Resident
Climate Zone
  • North Temperate (Californian Province &/or Northern Gulf of California)
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • South Temperate (Peruvian Province )
IUCN Red List
  • Listed
  • Least concern
  • Not listed
Length Max
  • 30
Depth Range Min
  • 3
Depth Range Max
  • 32