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Royal threadfin (Pentanemus quinquarius) — Polynemidae

Royal threadfin

Pentanemus quinquarius
Family: Polynemidae
LC · Least Concern

The Royal threadfin (Pentanemus quinquarius) is a saltwater fish of the family Polynemidae that grows up to 35 cm.

Length
35 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
Edibility
Highly prized

Description

The royal threadfin is a silvery bottom fish of the family Polynemidae (threadfins) reaching about 35 cm. Characteristic of the family is the blunt snout with an inferior mouth, and a row of separate, thread-like lower pectoral-fin rays — five in this species — 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 a valued commercial fish in West Africa landed by coastal fisheries.

Frequently asked questions

How do you recognise the Royal threadfin?

The Royal threadfin has a torpedo-shaped body, is mainly silver-grey and shows a plain pattern.

Where does the Royal threadfin live?

The Royal threadfin lives in the sea (marine waters) and is mostly found around sand or mud bottom.

How big does the Royal threadfin get?

The Royal threadfin grows to a maximum of about 35 cm. On average the species is around 25 cm.

Is the Royal threadfin dangerous to humans?

No, the Royal threadfin is harmless to humans.

Is the Royal threadfin edible?

Yes, the Royal threadfin is a highly prized food fish.

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All data

Identification

Dutch name
Koninklijke draadvinvis inferred
English name
Royal threadfin inferred
Scientific name
Pentanemus quinquarius
Family
Polynemidae
Other names
Beardfish; Captain Royal; Royal Threadfin; Royal threadfin; Thread fin verified

Appearance

Size class
Medium verified
Max length (cm)
35.0 verified
Average length (cm)
25.0 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
Origin
Native verified

Behaviour & biology

Diet
Carnivore verified
Social behaviour
Schooling verified
Territorial
No verified
Activity
Nocturnal inferred
Reproduction
Separate sexes verified
Sexual dimorphism
No verified

For anglers

Edibility
Highly prized verified
Fishing method
Bodemvissen met natuurlijk aas (worm, garnaal of vis) op of vlak boven de bodem. inferred
Regulations source
FishBase ↗ inferred

Safety

Danger to humans
Harmless verified

Status & sources

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

More from the family Polynemidae

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