Species: Dorosoma petenense, Threadfin shad
notch between top jaws
lateral scales 41-48
Dorosoma petenense (Günther, 1867)
Threadfin shad
Body deep, compressed; snout pointed, not bulging out past mouth at front; mouth small, at front, with notch between front of upper jaws; sides of lower jaw curved in below when viewed from front; last dorsal fin ray long, filamentous; anal fin short, 17-27 rays, origin just behind base of dorsal fin; pelvic fins on the abdomen below the dorsal fin, i, 7; a forked tail fin; scales large, regularly arranged, in 41-48 lateral rows; ventral profile a strongly convex keel of scutes.
Grey-brown to blue-black above; sides silver; a black spot a little behind upper edge of operculum.
Size: 23 cm.
Habitat: common in mouths of rivers; lives in rivers and freshwater lakes.
Depth: 0-10 m.
A northwest Atlantic species introduced into rivers of the NE Gulf of California.
High Resolution Map Download
- Salinity
-
- Brackish
- Freshwater
- Marine
- Inshore/Offshore
-
- Inshore Only
- Inshore
- Water Column Position
-
- Surface
- Near Surface
- Water column only
- Habitat
-
- Freshwater
- Water column
- Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
- Estuary
- FishBase Habitat
-
- Pelagic
- Feeding Group
-
- Data
- Planktivore
- Diet
-
- Zooplankton
- Pelagic fish larvae
- Pelagic fish eggs
- Data
- Phytoplankton
- Egg Type
-
- Pelagic
- No data
- Pelagic larva
- Global Endemism
-
- TEP non-endemic
- All species
- Exotic (Introduced)
- Regional Endemism
-
- Continent
- All species
- Continent only
- Tropical Eastern Pacific (TEP) non-endemic
- Eastern Pacific non-endemic
- Residency
-
- Resident
- Climate Zone
-
- Northern Subtropical (Cortez Province + Sinaloan Gap)
- North Temperate (Californian Province &/or Northern Gulf of California)
- IUCN Red List
-
- Least concern
- Listed
- CITES
-
- Not listed
- Length Max
-
- 23
- Depth Range Min
-
- 0
- Depth Range Max
-
- 10
