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Lesser African threadfin (Galeoides decadactylus) — Polynemidae

Lesser African threadfin

Galeoides decadactylus
Family: Polynemidae
LC · Least Concern

The Lesser African threadfin (Galeoides decadactylus) is a saltwater fish of the family Polynemidae that grows up to 50 cm.

Length
50 cm
Water
Saltwater
Depth
10.0–70.0 m
Diet
Carnivore
Behaviour
Schooling
Activity
Nocturnal
Body shape
Torpedo-shaped
Substrate
Sand / mud bottom
Danger
Harmless
Range
Eastern Atlantic along the coast of West Africa, over sandy and silty bottoms of turbid coastal water and estuaries; tolerates brackish water.
Edibility
Highly prized

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Description

The lesser African threadfin is a silvery bottom fish of the family Polynemidae (threadfins) reaching about 50 cm. Characteristic of the family is the blunt, projecting snout with an inferior mouth, and a row of separate, thread-like lower pectoral-fin rays that feel over the muddy bottom for prey like sensitive feelers. The species lives in schools over sand and mud bottoms of turbid coastal water and estuaries along the West African coast and tolerates brackish water. With its feeler rays it detects shrimps, small crustaceans, worms and small fish. The threadfin is an important commercial fish in West Africa, heavily landed by coastal and estuarine fisheries.

Frequently asked questions

How do you recognise the Lesser African threadfin?

The Lesser African threadfin has a torpedo-shaped body, is mainly silver-grey and shows a plain pattern. Silvery bottom fish with a blunt, protruding snout and a row of separate, thread-like lower pectoral fin rays that feel over the bottom as a sensory organ.

Where does the Lesser African threadfin live?

The Lesser African threadfin lives in the sea (marine waters) and is mostly found around sand or mud bottom. Eastern Atlantic along the coast of West Africa, over sandy and silty bottoms of turbid coastal water and estuaries; tolerates brackish water.

How big does the Lesser African threadfin get?

The Lesser African threadfin grows to a maximum of about 50 cm. On average the species is around 30 cm.

Is the Lesser African threadfin dangerous to humans?

No, the Lesser African threadfin is harmless to humans. None required: this species is harmless to humans.

Is the Lesser African threadfin edible?

Yes, the Lesser African threadfin is a highly prized food fish.

More photos

Lesser African threadfin (Galeoides decadactylus) — Polynemidae — 2
Wieber, Kimberly (CC0 1.0) via GBIF — USNM
Lesser African threadfin (Galeoides decadactylus) — Polynemidae — 3
iNaturalist ((c) Tom JAMONNEAU, some rights reserved (CC BY-NC))
Lesser African threadfin (Galeoides decadactylus) — Polynemidae — 4
Wikimedia Commons — Boulenger, George Albert, 1858-1937 (Public domain)
Lesser African threadfin (Galeoides decadactylus) — Polynemidae — 5
iNaturalist ((c) Tom JAMONNEAU, some rights reserved (CC BY-NC))
Fin

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All data

Identification

English name
Lesser African threadfin verified
Scientific name
Galeoides decadactylus
Family
Polynemidae
Other names
Guinean threadfin; Lesser African threadfin; Lesser African threadfish; Shinenose; Captain Plexiglass; Common threadfin; Shine-noise; Threadfin verified

Appearance

Size class
Large verified
Max length (cm)
50.0 verified
Average length (cm)
30.0 verified
Body shape
Torpedo-shaped sourced
Dominant colour
Silver / grey sourced
Pattern
Plain sourced
Tail shape
Forked inferred
Mouth position
Inferior (downward) inferred
Lips
Thick / fleshy inferred
Barbels
No verified
Dorsal fins
Two separate sourced
Dorsal spines
Yes verified

Habitat & distribution

Water type
Saltwater verified
Substrate
Sand / mud bottom verified
Min depth (m)
10.0 verified
Max depth (m)
70.0 verified
Natural range
Eastern Atlantic along the coast of West Africa, over sandy and silty bottoms of turbid coastal water and estuaries; tolerates brackish water. verified
Origin
Native verified

Behaviour & biology

Diet
Carnivore verified
Diet (detail)
Shrimps, small crustaceans, worms and small fishes from the bottom sourced
Social behaviour
Schooling verified
Territorial
No verified
Activity
Nocturnal inferred
Reproduction
Separate sexes verified
Sexual dimorphism
No verified
Seasonality
Forms shoals over soft bottoms, often in estuaries; eggs and larvae drift in open water. sourced
Special features
Silvery bottom fish with a blunt, protruding snout and a row of separate, thread-like lower pectoral fin rays that feel over the bottom as a sensory organ. sourced

For anglers

Edibility
Highly prized verified
Fishing method
Bottom fishing with shrimp or lugworm in murky coastal water; an important commercial fish in West Africa sourced
Regulations source
FishBase ↗ inferred

Safety

Danger to humans
Harmless verified
First aid
None required: this species is harmless to humans. sourced

Status & sources

Sources
FishBase via GBIF (DwC-A), CC-BY-NC 4.0

More from the family Polynemidae

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