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Flat-tail longtom (Platybelone argalus) — Belonidae

Flat-tail longtom

Platybelone argalus
Family: Belonidae
LC · Least Concern

The Flat-tail longtom (Platybelone argalus) is a saltwater fish of the family Belonidae that grows up to 50 cm.

Length
50 cm
Water
Saltwater
Depth
0.0–? m
Diet
Carnivore
Behaviour
Schooling
Activity
Diurnal
Body shape
Snake-like
Substrate
Stone or rock
Danger
Harmless
Range
Worldwide in tropical oceans, oceanic and near islands, shoaling in sheltered parts of the reef.
Edibility
Commonly eaten

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Description

The keeltail needlefish is a needlefish (family Belonidae) occurring worldwide in tropical oceans. The species grows to about 50 cm and has a very elongate, silvery-green body with a long, thin beak full of small, sharp teeth and a keeled caudal peduncle that gives it its name. It occurs oceanically and is particularly abundant around islands, where it schools in sheltered parts of the reef. Its diet consists mainly of small fishes. The species is oviparous and of value to subsistence fisheries. It can leap from the water when disturbed, the beak potentially causing injury.

Frequently asked questions

How do you recognise the Flat-tail longtom?

The Flat-tail longtom has a snake-like body, is mainly silver-grey and shows a plain pattern. Keeled tail base; can leap out of the water when disturbed, whereby the beak can cause injuries.

Where does the Flat-tail longtom live?

The Flat-tail longtom lives in the sea (marine waters) and is mostly found around stony or rocky ground. Worldwide in tropical oceans, oceanic and near islands, shoaling in sheltered parts of the reef.

How big does the Flat-tail longtom get?

The Flat-tail longtom grows to a maximum of about 50 cm. On average the species is around 35 cm.

Is the Flat-tail longtom dangerous to humans?

No, the Flat-tail longtom is harmless to humans. Needlefish may leap from the water when disturbed; the sharp, pointed beak can cause puncture wounds. Clean and disinfect the wound and see a doctor for a deep injury.

Is the Flat-tail longtom edible?

Yes, the Flat-tail longtom is commonly eaten.

More photos

Flat-tail longtom (Platybelone argalus) — Belonidae — 2
iNaturalist ((c) Spencer Ort, some rights reserved (CC BY-NC))
Flat-tail longtom (Platybelone argalus) — Belonidae — 3
iNaturalist ((c) GayleIsTired, some rights reserved (CC BY))
Flat-tail longtom (Platybelone argalus) — Belonidae — 4
iNaturalist ((c) Lisa Gerats, some rights reserved (CC BY-NC))
Flat-tail longtom (Platybelone argalus) — Belonidae — 5
iNaturalist ((c) Fabrice B, some rights reserved (CC BY-NC))
Fin

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All data

Identification

English name
Flat-tail longtom verified
Scientific name
Platybelone argalus
Family
Belonidae
Other names
Keeled needlefish; Keeltail needlefish; Keeltail Needlefish; Needlefish; Schooling longtom verified

Appearance

Size class
Large verified
Max length (cm)
50.0 verified
Average length (cm)
35.0 verified
Body shape
Snake-like sourced
Dominant colour
Silver / grey inferred
Pattern
Plain inferred
Tail shape
Forked inferred
Mouth position
Beak-shaped inferred
Lips
Thin inferred
Barbels
No sourced
Dorsal fins
One continuous inferred
Dorsal spines
No sourced

Habitat & distribution

Water type
Saltwater sourced
Substrate
Stone or rock sourced
Min depth (m)
0.0 verified
Natural range
Worldwide in tropical oceans, oceanic and near islands, shoaling in sheltered parts of the reef. inferred
Origin
Native sourced

Behaviour & biology

Diet
Carnivore sourced
Diet (detail)
Mainly small fishes sourced
Social behaviour
Schooling inferred
Territorial
No inferred
Activity
Diurnal inferred
Reproduction
Separate sexes sourced
Sexual dimorphism
No inferred
Seasonality
Present year-round in its habitat; no pronounced seasonality known. inferred
Special features
Keeled tail base; can leap out of the water when disturbed, whereby the beak can cause injuries. sourced

For anglers

Edibility
Commonly eaten sourced
Fishing method
Casting with small lures at the surface; also caught under lights. sourced
Regulations source
FishBase ↗ inferred

Safety

Danger to humans
Harmless sourced
First aid
Needlefish may leap from the water when disturbed; the sharp, pointed beak can cause puncture wounds. Clean and disinfect the wound and see a doctor for a deep injury. sourced

Status & sources

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

More from the family Belonidae

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