Shorefishes of the Eastern Pacific online information system

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Species: Elattarchus archidium, Bluestreak drum, Bluish croaker

All Families:   All Genera:   All Species:

elongate, compressed; mouth large, oblique
adult plain
juvenile - 2 stripes + C base spot
C straight
large canines - front lower jaw
preopercle angle: 5-6 spines, lowest points down
A: II (2nd long, thin), 8-9

Elattarchus archidium (Jordan & Gilbert, 1882)

Bluestreak drum, Bluish croaker

Body moderately elongate, compressed; snout blunt; eye moderately large; mouth large, oblique, opens at front; chin withouth barbells, with 5 pores; a row of canine teeth on each jaw, with enlarged pair at front of lower jaw; lower gill rakers 13-18; longest gill raker > ½ length of gill filaments; margin of preopercle with 5-7 spines at angle, the lowermost directed downwards or slightly forward; dorsal rays X+I- II,24-28; anal rays II, 8-9, 2nd  spine long (¾ length of first ray), longer than base of fin; pectorals long, reach past pressed down pelvics; tail edge straight; scales rough on body, smooth elsewhere; pored lateral-line scales 47-56.

Silver, bluish grey on upper back; black half-moon at inside front of lower jaw; dark oblique stripes often present on sides (following scale rows); tip of spinous dorsal fin dusky, pectoral and anal fins clear to yellowish; young with pair of black stripes on upper side and black spot at base of caudal fin.

Size: to 25 cm.

Inhabits shallow coastal waters, often off sandy beaches or in sheltered bays, but seldom in estuaries; the young form large aggregations on or near rocky reefs.

Depth: 2-50 m.

Southern Baja and the Gulf of California to northern Peru.

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  • Brackish
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Near Bottom
  • Bottom + water column
  • Bottom
  • Mid Water
  • Sand & gravel
  • Water column
  • Estuary
  • Beach
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Mud
FishBase Habitat
  • Bentho-Pelagic
Feeding Group
  • Planktivore
  • No Data
  • Pelagic fish larvae
  • No Data
  • Zooplankton
Egg Type
  • Pelagic
  • Pelagic larva
  • No data
Global Endemism
  • Tropical Eastern Pacific (TEP) endemic
  • East Pacific endemic
  • All species
Regional Endemism
  • All species
  • TEP endemic
  • Continent only
  • Continental TEP endemic
  • 3 provinces (Cortez + Mexican + Panamic) 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)
  • North Temperate (Californian Province &/or Northern Gulf of California)
  • South Temperate (Peruvian Province )
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 25
Depth Range Min
  • 2
Depth Range Max
  • 50