Species: Atherinella alvarezi, Alvarez's Silverside, Gulf Silverside
20-29 gill rakers
Atherinella alvarezi (Diaz-Pardo, 1972)
Gulf Silverside, Alvarez's 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.
High Resolution Map Download
- Salinity
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- Brackish
- Freshwater
- Non Marine
- Inshore/Offshore
-
- Inshore
- Inshore Only
- Water Column Position
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- Bottom
- Mid Water
- Near Bottom
- Water column only
- Habitat
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- Sand & gravel
- Water column
- Estuary
- Freshwater
- Mangrove
- FishBase Habitat
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- Pelagic
- Feeding Group
-
- Data
- Omnivore
- Planktivore
- Diet
-
- Data
- Insects
- Mobile benthic crustacea (shrimps/crabs)
- Phytoplankton
- Egg Type
-
- Benthic
- Data
- Pelagic larva
- Global Endemism
-
- All species
- Greater Caribbean endemic
- West Atlantic Endemic
- Regional Endemism
-
- Continent
- Continent only
- GC endemic
- Gulf of Mexico endemic
- All species
- Residency
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- Resident
- Climate Zone
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- Tropical (10-23N, Nicaragua / Cuba)
- IUCN Red List
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- Least concern
- Listed
- CITES
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- Not listed
- Length Max
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- 9.8
- Depth Range Min
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- 0
- Depth Range Max
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- 10
