Shorefishes of the Eastern Pacific online information system

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Species: Hemanthias peruanus, Rose thread-tail bass, Split-tail bass

All Families:   All Genera:   All Species:

body: lot yellow
C: middle rays longest
no hook under throat
pectoral 16-18

Hemanthias peruanus (Steindachner, 1874)

Split-tail bass, Rose thread-tail bass

Body elongate, compressed; head short, compressed; eye large;  mouth strongly oblique; without accessory bone above top jaw bone; canine teeth at front of mouth; teeth on center and sides of roof of mouth; preopercle margin serrated above and below; 31-33 (rarely 34) gill rakers; dorsal rays IX-X,13-15, third dorsal spine long and filamentous, at least in adults; anal rays III, 7-9; pectoral rays 17-18 (rarely 16); tail fin deeply forked, middle rays longest; pelvics long, passing origin of anal fin; scales small, rough,  3-4 rows between 5th  dorsal fin spine and lateral line; top jaw and most of snout and area between eyes scaleless;  pored lateral-line scales 52-55 (occasionally 56-59.

Head and body reddish; head with a yellow stripe under eye, curving up to top corner of opercle; sides of body with yellow blotches and spots; fins red, with yellow spots and yellow borders

Size: grows to 45 cm.

Inhabits rocky reefs.

Depth: 20-120 m.

Central Baja to the Gulf of California to Peru, the Galapagos.

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  • Marine Only
  • Marine
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom
  • Bottom + water column
  • Near Bottom
  • Sand & gravel
  • Reef (rock/coral/oyster)
  • Rocks
  • Reef and soft bottom
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Reef associated (reef + edges-water column & soft bottom)
  • Water column
FishBase Habitat
  • Pelagic
Feeding Group
  • Planktivore
  • Data
  • Data
  • Zooplankton
  • Pelagic fish larvae
  • Pelagic fish eggs
Egg Type
  • Pelagic larva
  • No data
  • Pelagic
Global Endemism
  • Tropical Eastern Pacific (TEP) endemic
  • All species
  • East Pacific endemic
Regional Endemism
  • TEP endemic
  • Continent + Island (s)
  • Island (s)
  • All species
  • Continent
  • Resident
Climate Zone
  • South Temperate (Peruvian Province )
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
  • North Temperate (Californian Province &/or Northern Gulf of California)
IUCN Red List
  • Listed
  • Least concern
  • Not listed
Length Max
  • 45
Depth Range Min
  • 20
Depth Range Max
  • 120