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Species: Etropus peruvianus, Peruvian flounder

All Families:   All Genera:   All Species:

body height < 1/2 SL
large elongate dark blotch behind operculum
pectoral: outer 1/3 dark
LL straight, 40-45
D 75-85: A 59-67

Etropus peruvianus Hildebrand, 1946

Peruvian flounder

Body relatively slender (height 34-45% of SL); head blunt, short, length 25-29% of SL; eyes on left side (uncommonly on right side), ~ parallel, upper eye below edge of head, with crest behind it; mouth very small, 21-25% of head, ends under front edge of pupil; jaws on blind side arched; most of teeth on blind side, in 1 row on each jaw, none enlarged; lower gill rakers 5-9; dorsal rays 79-86; anal rays 62-68; base of eye side pelvic on midline of body, 6 pelvic fin rays; pectoral fin 80% of head length; tail fin with blunt angular point; urinary papilla on blind side, immediately behind anus; lateral line starts at top corner of operculum, relatively straight; scales small, rough, easily dislodged, without small accessory scales; 41-48 lateral line scales.

Eye side grey-brown, large dark blotch behind operculum that extends back along lower flank behind pectoral, fins paler than body, with dark speckles, pectoral with outer 1/3 dark; blind side pale.

Size: 10 cm.

Habitat: shallow soft bottoms.

Depth: 0-45 m.

Southern Baja and the Gulf of California to northern Peru.

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  • Marine
  • Brackish
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom only
  • Bottom
  • Mud
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Soft bottom only
  • Sand & gravel
FishBase Habitat
  • Demersal
Feeding Group
  • No Data
  • Carnivore
  • No Data
  • Mobile benthic worms
  • Bony fishes
  • Octopus/squid/cuttlefish
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • Pelagic
  • Pelagic larva
  • No data
Global Endemism
  • All species
  • East Pacific endemic
  • Tropical Eastern Pacific (TEP) endemic
Regional Endemism
  • Continent only
  • 3 provinces (Cortez + Mexican + Panamic) endemic
  • Continent
  • All species
  • Continental TEP endemic
  • TEP endemic
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
  • South Temperate (Peruvian Province )
  • North Temperate (Californian Province &/or Northern Gulf of California)
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 10
Depth Range Min
  • 0
Depth Range Max
  • 45