Shorefishes of the Greater Caribbean online information system

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Species: Cynoscion arenarius, Sand Seatrout, Sand Weakfish

All Families:   All Genera:   All Species:

uniform color
D1 25-29, few basal scale rows
C S shaped
inner lower teeth: rear larger, widely spaced
A 10-12
pectoral > pelvic
body scales rough, = / > LL scales

Cynoscion arenarius Ginsburg, 1930

Sand Seatrout, Sand Weakfish

Elongate and moderately compressed; mouth large, oblique, lower jaw slightly projecting; teeth in multiple rows with 2 large canines at tip of upper jaw; lower jaw with row of widely spaced larger teeth that gradually increase in size towards rear of mouth; gill rakers long and slender, 12-14; no pores or barbels on chin; 2 pores on side of snout; preoperculum smooth; top corner of gill opening notched; dorsal rays IX-X + I, 25-29; anal rays II (weak), 10-12; pectoral fins slighty > pelvic fins, >1/2 head length; rear margin of tail doubly concave in adult; scales rough on body, smooth on head; body scales equal or larger than lateral line scales; soft dorsal with a few rows of small scales on base; lateral line arched anteriorly and straight well before level of anus, extends to the center of the end of the tail fin.

Body uniform silver; a dark area in upper base and axil of pectoral fin; lower parts of pectoral, pelvic and anal fins yellowish; inside opercle dusky.

Size: reaches 64 cm.

Inhabits sandy bottoms of coastal waters, common in surf zones and estuaries.

Depth: 1-182 m.

The Gulf of Mexico; also on the central east coast of Florida, where it hybridizes with C regalis.

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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
  • Submerged vegetation
  • Beach
  • Estuary
  • Freshwater
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • Data
  • Planktivore
  • Data
  • Zooplankton
  • Bony fishes
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic worms
Egg Type
  • Data
  • Pelagic
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean endemic
  • West Atlantic Endemic
Regional Endemism
  • GC endemic
  • Gulf of Mexico endemic
  • All species
  • Resident
Climate Zone
  • Subtropical (23-35N, Florida / Carolinas / Bermuda)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 64
Depth Range Min
  • 1
Depth Range Max
  • 182