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Species: Achirus declivis, Plainfin Sole

All Families:   All Genera:   All Species:

eye side: uniform + 7 thin, dark cross-lines; no cirri
C no dark spots
blind side all pale
D 49-60; A 38-48
pectoral 5-6

Achirus declivis Chabanaud, 1940

Plainfin Sole

Body oval; eyes on right side; snout rounded; front margin of head with short tentacles; mouth small, oblique, a little under snout; lips fleshy; eyes small; rear edge of preopercle covered with skin, visible as a superficial groove; gill openings wide, united before pelvic fins; an opening connects gill chambers on both sides; dorsal origin ~ above eye dorsal rays 49-60; anal rays 33-48; pelvic on eye side fused to anal fin; pectoral rays usually 5-6; lateral line from head to tail, straight, with perpendicular branches running across body; body covered with rough scales, eye-side without cirri.

Eye-side of body uniform, with ~7 thin dark crossbars rest uniform; tail fin without dark spots or blotches; no dark shading at rear of pale body on blind side.

Size: to 18 cm.

Inhabits soft bottoms in brackish to marine conditions.

Depth: 1-31 m.

The NW Caribbean to Brazil.

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  • Brackish
  • Freshwater
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Sand & gravel
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Soft bottom only
  • Estuary
  • Freshwater
  • Mud
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • Data
  • Data
  • Bony fishes
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic worms
Egg Type
  • Data
  • Pelagic
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean non-endemic
  • West Atlantic Endemic
Regional Endemism
  • Also in Brazil
  • Continent
  • Continent + Island (s)
  • Continental primarily
  • Extends South of GC
  • GC non-endemic
  • Island (s)
  • All species
  • Resident
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
  • Tropical (10-23N, Nicaragua / Cuba)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 18
Depth Range Min
  • 1
Depth Range Max
  • 31