Shorefishes of the Eastern Pacific online information system

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Species: Psenes sio, Two-spine driftfish

All Families:   All Genera:   All Species:

elongate, body not soft
D2 23-25; A 23-24
juvenile: brown + 3 bars, mouth yellow, opercle black
bottom teeth large daggers, top conical

Psenes sio Haedrich, 1970


Two-spine driftfish


Body elongate (deeper in juvenile) compressed, not soft and flabby; snout blunt; eye moderate, with ring of fatty tissue around it; operculum thin, with 2 short spines; mouth small, at front; jaw teeth small, conical, in 1 row, adult lower jaw with knife-like teeth; teeth on front and sides of roof of mouth, and base of gill arches; 2 scarcely separate dorsal fins, XI-XII + I, 23-25, spines shorter than rays, its origin before, or, in large specimens, over pectoral origin; pectoral long, bluntly pointed (long but shorter in juvenile),16-18 rays; pelvics originate under or before pectoral base, attached to the abdomen, fold into a groove, fins long in juvenile; anal fin II weak spines, 23-24; tail fin deeply forked in adult, rounded tips in juvenile; branched mucous canal along length of flank; scales very small, very thin, cover bases of median fins, on top of head in a narrow band, reach only to between eyes; lateral line high on body.

(Preserved juvenile) light brown, with 3 indistinct dark bars; 1st  dorsal dark, other fins whitish; inside mouth yellow; inside operculum black; iris grey.

Size: 28 cm.

Habitat: oceanic.

Depth: 0-500 m.

Southern Baja and the central Gulf of California to Chile, and the Galapagos.

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  • Marine
  • Marine Only
  • Offshore Only
  • Offshore
Water Column Position
  • Surface
  • Water column only
  • Mid Water
  • Near Surface
  • Water column
FishBase Habitat
  • Bentho-Pelagic
Feeding Group
  • No Data
  • Carnivore
  • Planktivore
  • Pelagic fish eggs
  • Bony fishes
  • Pelagic jellyfish/ctenophores
  • No Data
  • Zooplankton
Egg Type
  • No data
  • Pelagic
  • Pelagic larva
Global Endemism
  • East Pacific endemic
  • All species
  • Tropical Eastern Pacific (TEP) endemic
Regional Endemism
  • Continent + Island (s)
  • Continent
  • All species
  • Island (s)
  • TEP endemic
  • Resident
Climate Zone
  • South Temperate (Peruvian Province )
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 28
Depth Range Min
  • 0
Depth Range Max
  • 500