Shorefishes of the Eastern Pacific online information system

Español  Contact

Species: Cynoscion nannus, Deepwater weakfish, Dwarf weakfish, Dwarf corvina

All Families:   All Genera:   All Species:

large head & eye
D IX-X+ I, 18-21
C edge: blunt, angular/rounded
roof mouth & gill chamber black
pectoral long
soft D & A: inner 1/2 scaled
rear 3/4 body scales rough

Cynoscion nannus Castro-Aguirre & Arvizu-Martinez, 1976

Dwarf corvina, Dwarf weakfish, Deepwater weakfish

Elongate, fusiform, compressed, oval cross-section; head low, long (33.3-38.5% SL), pointed; eye large (25-33% of head length); mouth a little oblique, reaches to middle of pupil; front of top jaws with 1 pair of large pointed canines; no barbels or pores on chin; 8-10 lower gill rakers; preopercle smooth in adult (with 2 spines in juvenile); dorsal with long base, a small gap separating the two parts, IX-X + I, 18-21;  anal II, 8-10, small, length of base ~ snout length; pectoral fins 16-17,  relatively long (~25% SL), reaching past pelvic tip; rear margin of tail bluntly angular to rounded; scales rough on rear ¾ body, smooth in front and head, 49-59 pored on lateral line, 5-7 scales between lateral line and dorsal origin, lateral line scales larger than adjacent scales, and with small accessory scales; inner ½ of membranes of soft dorsal and anal fins scaled; lateral line arched at front.

Dark above, silver below; sides with undulating dark lines along scale rows; roof of mouth and gill chamber black, latter visible through side of gill covers; inner base of pectoral black.

Size: 27 cm.

Habitat: offshore, continental shelf, on bottom and midwater.

Depth: 100-815 m.

The SW and SE Gulf of California to Panama.

High Resolution Map Download

Species Data Create Report Export as Word File Export as Excel File
  • Marine
  • Marine Only
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Near Bottom
  • Mid Water
  • Bottom + water column
  • Mud
  • Water column
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
FishBase Habitat
  • Bentho-Pelagic
Feeding Group
  • No Data
  • Carnivore
  • Bony fishes
  • Pelagic crustacea
  • No Data
  • Octopus/squid/cuttlefish
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • No data
  • Pelagic
  • Pelagic larva
Global Endemism
  • Tropical Eastern Pacific (TEP) endemic
  • East Pacific endemic
  • All species
Regional Endemism
  • 3 provinces (Cortez + Mexican + Panamic) endemic
  • Continental TEP endemic
  • All species
  • Continent
  • TEP endemic
  • Continent only
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 27
Depth Range Min
  • 100
Depth Range Max
  • 815