Shorefishes of the Eastern Pacific online information system

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Species: Atherinella crystallina, Blackfin silverside, Presidio silverside

All Families:   All Genera:   All Species:

top of back - dark stripe
D1, front D2 & front A - all dark
D1 origin behind A origin
pectoral base dark
A 16-27, no scales
35-49 lateral scales

Atherinella crystallina (Jordan and Culver, 1895)

Blackfin silverside, Presidio silverside

Head length 23.4% of SL; top of head profile ~ straight; sensory system on snout with L shaped furrows at front; top jaw extendible; first dorsal short, not reaching base of second dorsal, front spines longest, II-VI, its origin behind origin of anal; second dorsal margin straight to slightly concave, front rays not very long, its base ends before base of anal; anal I, 16-27 (usually I, 21) rays, no scales, rear margin straight, with anterior rays longest; pectoral fin straight to curved, not reaching anus; 35-49 (39) lateral scales, 6-10 transverse rows of scales; large scale at side of pelvic fin base.

Fleshy base of pectoral darkly pigmented; male with dark-tipped pelvics (no pigment in female); first dorsal fin, front of second dorsal and front of anal dusky, darker in males than females; dark stripe along top of back; heart-shaped dark pigment patch over rear of brain; stripe along side sometimes silvery, not constricted on tail base, width < ½ eye diameter; swim bladder has window-like appearance through belly muscles.

Size: 10 cm.

Habitat: Usually in freshwater but also in estuaries.

Depth: 0-10 m.

Restricted to the SE Gulf of California.

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  • Freshwater
  • Non Marine
  • Brackish
  • Inshore Only
  • Inshore
Water Column Position
  • Water column only
  • Surface
  • Near Surface
  • Freshwater
  • Water column
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Estuary
FishBase Habitat
  • Pelagic
Feeding Group
  • Planktivore
  • No Data
  • Zooplankton
  • Pelagic fish larvae
  • No Data
  • Pelagic fish eggs
Egg Type
  • Pelagic larva
  • No data
  • Benthic
Global Endemism
  • East Pacific endemic
  • Tropical Eastern Pacific (TEP) endemic
  • All species
Regional Endemism
  • All species
  • Continental TEP endemic
  • Continent
  • TEP endemic
  • Cortez + Mexican provinces endemic
  • Continent only
  • Resident
Climate Zone
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
IUCN Red List
  • Near threatened
  • Listed
  • Not listed
Depth Range Min
  • 0
Depth Range Max
  • 10
Length Max
  • 10