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Species: Cynoscion similis, Tonkin Weakfish

All Families:   All Genera:   All Species:

back: oblique dotted lines along scale rows
D2 24-28, 1-2 rows scales at base
pectoral (18) & A: black
C straight/slightly concave
inner lower teeth close-set, central strongest
lower jaw reaches under rear edge eye
inside operculum black
pectoral > pelvic
body scales laarge, rough, = / > LL scales

Cynoscion similis Randall & Cervigón, 1968

Tonkin Weakfish

Elongate, fusiform, compressed, oval cross-section; head low, not spongy on top; eye moderate; mouth large, oblique, lower jaw slightly projecting, lower jaw with rounded end reaching under rear edge of eye; teeth in multiple rows with 1-2 large canines at tip of upper jaw, inner row of teeth on lower jaw close-set, middle teeth stronger; gill rakers short (< filaments), 9-12; no pores or barbels on chin; 2 pores on side of snout; margin of preopercle smooth; top corner of gill opening notched; dorsal rays X + I, 24-28; anal rays II, weak spines, 8-10; pectoral fins slightly > pelvic fins, usually 18; rear margin of tail straight to slightly concave; scales on body large and rough, equal to or larger than lateral line scales; soft dorsal with 1-2 rows of small scales along its base; lateral line arched anteriorly and straight well before level of anus, extends to the center of the end of the tail fin.

Body silvery grey above, silvery below; back with oblique dotted lines along scale rows; spinous dorsal fin margin dark; pectoral and anal fins black; inside operculum black, visible externally.

Size: reaches 60 cm.

Inhabits shallow coastal sand and mud bottoms.

Depth: 1-125 m.

Colombia to northern Brazil.

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  • Marine
  • Marine Only
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Sand & gravel
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Soft bottom only
  • Mud
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • Data
  • Data
  • Bony fishes
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • Data
  • Pelagic
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean non-endemic
  • West Atlantic Endemic
Regional Endemism
  • Also in Brazil
  • Continent
  • Continent only
  • Extends South of GC
  • GC non-endemic
  • All species
  • Resident
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 60
Depth Range Min
  • 1
Depth Range Max
  • 125