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Species: Trachurus lathami, Rough Scad

All Families:   All Genera:   All Species:

fatty eye-lid
top corner operculum: black spot
D & A: no finlets behind
LL: extension below D
pectoral > head
all of LL with scutes

Trachurus lathami Nichols, 1920

Rough Scad

Elongate, moderately compressed; upper and lower head profiles about equal; teeth small, a single row on each jaw; a small upper furrow but no papillae at front of shoulder at rear edge of gill chamber; eye with fatty eyelid; gill rakers 12-16 + 33-41; dorsal rays VIII + I, 28-34; anal rays II+I, 26-30; no finlets behind dorsal and anal fins; last ray of dorsal and anal fins about 50% further from the rest than they are from each other; pectoral fins longer than head, reach past origin of anal fin; tail base slender; tail strongly forked; well developed, vertically expanded scutes (large spiny scales) on both curved and straight parts of lateral line, 33-39 scutes (which may be overgrown with small scales in large fish) on straight part, total of 61-77 scutes + scales; scales obvious over all of body except just behind pectoral fin. lateral line moderately arched anteriorly; accessory lateral line extends back under between spine VIII and ray 4 of dorsal fin.

Dusky to dark blue to olive green on back, lower two-thirds paler; small narrow dark area over eye; no distinctive markings except black spot on upper edge of gill opening.

Size: reaches about 40 cm.

Habitat: a coastal pelagic, schooling species.

Depth: 5-110 m, usually near the bottom at 50-90 m.

Maine to Argentina.

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  • Marine
  • Marine Only
  • Inshore
  • Inshore Only
Water Column Position
  • Mid Water
  • Near Surface
  • Surface
  • Water column only
  • Water column
  • Reef associated (reef + edges-water column & soft bottom)
FishBase Habitat
  • Pelagic
  • Reef Associated
Feeding Group
  • Carnivore
  • Data
  • Planktivore
  • Data
  • Zooplankton
  • Bony fishes
  • Octopus/squid/cuttlefish
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 N + S of GC
  • Extends North of GC
  • Extends South of GC
  • GC non-endemic
  • All species
  • Resident
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
  • Subtropical (23-35N, Florida / Carolinas / Bermuda)
  • Temperate (>35N)
  • Tropical (10-23N, Nicaragua / Cuba)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 40
Depth Range Min
  • 5
Depth Range Max
  • 110