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Species: Atherinella nocturna, Flat silverside

All Families:   All Genera:   All Species:

head deep
silver stripe narrow ( < 1.5 scale rows)
D1 origin ~over A origin
D2 base ends before end of A base
pelvics reach anus
A base: front 2/3 - 2 rows scales
55-59 lateral scales

Atherinella nocturna Myers & Wade, 1942

Flat silverside

Body relatively deep anteriorly (22.2-23.8% of SL); head short, deep (19.3-29.8% SL) ; snout short and rounded; wide and convex between eyes; upper profile curved slightly up from snout to about mid-body, then down to horizontal top of tail base; lower profile deeply convex from mouth back to end of anal fin base;  mouth oblique, opens at front, curved, top jaw extendible;  teeth on top and bottom jaws small, pointed, depressible, 2 irregular rows at front, a single row at sides; dorsal fin III-IV + I, 9-10,  origin of 1st  dorsal over or slightly behind origin of anal fin; base of last 2nd dorsal ray before base of last anal ray; pelvics reach to anus; 55-59 scales in lateral series; 23-27 predorsal scales; anal fin I, 26-29, with a well developed scale sheath of 2 rows of scales along the front 2/3 (or more) of fin base.

Silver stripe on flank relatively narrow (1.5 scale rows wide).

Size: to 10 cm.

Habitat: pelagic, coastal.

Depth: 0-10 m?

S Ecuador to Chile.

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  • Marine
  • Marine Only
  • Inshore Only
  • Inshore
Water Column Position
  • Surface
  • Near Surface
  • Water column only
  • Water column
FishBase Habitat
  • Pelagic
Feeding Group
  • Planktivore
  • No Data
  • No Data
  • Pelagic fish larvae
  • Pelagic fish eggs
  • Zooplankton
Egg Type
  • Benthic
  • Pelagic larva
  • No data
Global Endemism
  • TEP non-endemic
  • All species
  • East Pacific endemic
Regional Endemism
  • Temperate Eastern Pacific, primarily
  • All species
  • Continent only
  • Continent
  • Peruvian province, primarily
  • Tropical Eastern Pacific (TEP) non-endemic
  • Vagrant
Climate Zone
  • South Temperate (Peruvian Province )
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 10
Depth Range Min
  • 0
Depth Range Max
  • 10