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Species: Atherinella alvarezi, Alvarez's silverside, Gulf silverside

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rear end jaw turns down, not reaching under eye
20-29 gill rakers
A scale sheath not along entire base
scales: 35-40 lateral, 18-22 around body, 7-9 transverse

Atherinella alvarezi (Diaz-Pardo, 1972)

Alvarez's silverside, Gulf silverside

Elongate; sensory pits on snout not as 4 large quadrangular pits; top jaw extendible, premaxilla with rear end greatly expanded, without expanded bony process above its center, rear margin of jaw curves down, doesn’t reach level of eye; lower gill rakers 20-29 (rarely 19); dorsal rays IV (origin behind origin of anal fin) + I,12 or fewer soft rays; pectoral fins long, reaching past pelvic fins, inserted high on body, above mid-level of eye; mid-side scales 35-40, rarely 41; transverse scale rows 7-9; body circumferential scales 18-22; anal fin scale sheath not extending beyond midpoint of base of fin; a large scale at base of pelvic fins.

Bright yellow to yellow green; top cross-hatched with dark pigment lines; a dark silver midlateral stripe.

Size: reaches 9.8 cm.

Habitat: primarily freshwater but enters brackish water of estuaries.

Depth: 0-10 m?

The SW Gulf of Mexico.

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  • Brackish
  • Freshwater
  • Non Marine
  • Inshore Only
  • Inshore
Water Column Position
  • Mid Water
  • Near Bottom
  • Bottom
  • Water column only
  • Water column
  • Estuary
  • Freshwater
  • Sand & gravel
  • Mangrove
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
FishBase Habitat
  • Pelagic
Feeding Group
  • Omnivore
  • Planktivore
  • No Data
  • Insects
  • Phytoplankton
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • Pelagic larva
  • No data
  • Benthic
Global Endemism
  • Greater Caribbean endemic
  • West Atlantic Endemic
Regional Endemism
  • Continent
  • Continent only
  • Gulf of Mexico endemic
  • GC endemic
  • Resident
Climate Zone
  • Tropical (10-23N, Nicaragua / Cuba)
IUCN Red List
  • Not evaluated / Listed
  • Not listed
Length Max
  • 9.8
Depth Range Min
  • 0
Depth Range Max
  • 10