Shorefishes of the Eastern Pacific online information system

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Species: Syacium longidorsale, Long-fin flounder, Pompadour flounder

All Families:   All Genera:   All Species:

eyes together, parallel
snout < eye
D: rays 3-5 elongate
tail base wide
7-9 lower gill rakers
pectoral: 1st ray long

Syacium longidorsale Murakami & Amaoka, 1992

Pompadour flounder, Long-fin flounder

Body height 42-48% of SL; head length 26-28% of SL; snout profile convex, at most a slight notch before top eye; snout (to top eye) shorter than eye, length before top eye < 24% of head length; eyes on left side (uncommonly on right side);  eyes parallel; width between eyes < 6% of head length; mouth of moderate length, 31-37% of head length, ends under mid-eye; jaws on blind side not arched; fixed teeth in 2 rows in upper jaw, 1 row lower jaw; 7-9 short, fat, serrated lower gill rakers; dorsal rays 82-92, 3rd-5th  rays long, ~ 30-50% of head length; 65-74 anal rays; eye-side pectoral 67-78% of head length (to 115% in male, with 1st  ray elongate); base of eye side pelvic on midline of body; urinary papilla on blind side, immediately behind anus; tail base relatively wide (width 37-45% of SL); lateral line not extending onto head, starts at corner of operculum, relatively straight; 50-57 lateral line scales; scales very rough in eye-side, smooth an blind side.

Eye side grey-brown, dorsal and anal with row of dark spots, pelvic a little darker, rear ½ of tail streaked; blind side yellow-white.

Size: 15 cm.

Habitat: sand and mud bottoms.

Depth: 10-40 m.

SE Gulf of California to Peru.

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  • Marine Only
  • Marine
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom only
  • Bottom
  • Sand & gravel
  • Soft bottom only
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
FishBase Habitat
  • Demersal
Feeding Group
  • No Data
  • Carnivore
  • Bony fishes
  • Mobile benthic crustacea (shrimps/crabs)
  • No Data
Egg Type
  • Pelagic larva
  • No data
  • Pelagic
Global Endemism
  • Tropical Eastern Pacific (TEP) endemic
  • East Pacific endemic
  • All species
Regional Endemism
  • All species
  • Continent only
  • Continental TEP endemic
  • 3 provinces (Cortez + Mexican + Panamic) endemic
  • TEP endemic
  • Continent
  • Resident
Climate Zone
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
  • South Temperate (Peruvian Province )
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 15
Depth Range Min
  • 10
Depth Range Max
  • 40