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Anomalous pencilfish (Nannostomus beckfordi) — Lebiasinidae

Anomalous pencilfish

Nannostomus beckfordi
Family: Lebiasinidae
LC · Least Concern

The Anomalous pencilfish (Nannostomus beckfordi) is a freshwater fish of the family Lebiasinidae that grows up to 7 cm.

Length
6.5 cm
Water
Freshwater
Diet
Omnivore
Behaviour
Small groups
Activity
Diurnal
Body shape
Elongated (eel-like)
Substrate
Mixed bottom
Danger
Harmless
Range
Freshwater of northern South America, including the Amazon and Guiana region.
Edibility
Not eaten

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Description

The golden pencilfish is a small characin of the family Lebiasinidae from northern South America. The species reaches only about 6.5 cm and has a thin, pencil-shaped body with a shining golden to brownish flank and a dark lengthwise stripe. It inhabits small, slow-flowing rivers and swamps, where it lives in groups. Males defend small territories and are more brightly coloured than females. As an omnivore it searches for small invertebrates and plant matter in the upper water layers. The species is very popular with aquarists and harmless to humans.

Frequently asked questions

How do you recognise the Anomalous pencilfish?

The Anomalous pencilfish has an elongate, eel-like body, is mainly yellow-gold and shows a horizontal stripes pattern. Slender, pencil-shaped body with a golden sheen; males defend small territories.

Where does the Anomalous pencilfish live?

The Anomalous pencilfish lives in fresh water and is mostly found around mixed bottom. Freshwater of northern South America, including the Amazon and Guiana region.

How big does the Anomalous pencilfish get?

The Anomalous pencilfish grows to a maximum of about 7 cm.

Is the Anomalous pencilfish dangerous to humans?

No, the Anomalous pencilfish is harmless to humans. This species is harmless to humans. No specific first aid is needed. Still handle the fish with care: mind the fin rays and the sharp edges of the gill cover, and rinse any scratch with clean water and cover it. For a dirty or deep wound check tetanus status.

Is the Anomalous pencilfish edible?

The Anomalous pencilfish is not usually eaten.

More photos

Anomalous pencilfish (Nannostomus beckfordi) — Lebiasinidae — 2
iNaturalist ((c) clhoe_abcmatoury, some rights reserved (CC BY-NC))
Anomalous pencilfish (Nannostomus beckfordi) — Lebiasinidae — 3
Florida Museum of Natural History Ichthyology (CC BY-NC 4.0) via GBIF — UF
Anomalous pencilfish (Nannostomus beckfordi) — Lebiasinidae — 4
iNaturalist ((c) Mark Henry Sabaj, some rights reserved (CC BY-NC))
Anomalous pencilfish (Nannostomus beckfordi) — Lebiasinidae — 5
iNaturalist ((c) xavier_francois, some rights reserved (CC BY-NC))
Fin

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All data

Identification

English name
Anomalous pencilfish verified
Scientific name
Nannostomus beckfordi
Family
Lebiasinidae
Other names
Aripiranga pencilfish; Beckford's Pencil Fish; Brown pencilfish; Golden pencilfish verified

Appearance

Size class
Small verified
Max length (cm)
6.5 verified
Body shape
Elongated (eel-like) sourced
Dominant colour
Yellow / gold inferred
Pattern
Horizontal stripes inferred
Tail shape
Forked inferred
Mouth position
Superior (upward) inferred
Lips
Thin inferred
Barbels
No sourced
Dorsal fins
One continuous inferred
Dorsal spines
No sourced

Habitat & distribution

Water type
Freshwater sourced
Substrate
Mixed bottom sourced
Natural range
Freshwater of northern South America, including the Amazon and Guiana region. inferred
Origin
Native sourced

Behaviour & biology

Diet
Omnivore sourced
Diet (detail)
Small invertebrates and plant material sourced
Social behaviour
Small groups inferred
Territorial
Yes inferred
Activity
Diurnal inferred
Reproduction
Separate sexes sourced
Sexual dimorphism
Yes inferred
Seasonality
Reproduction coincides with the rainy season. inferred
Special features
Slender, pencil-shaped body with a golden sheen; males defend small territories. sourced

For anglers

Edibility
Not eaten sourced
Fishing method
Not a target species for angling; at most an incidental catch or usable as baitfish. inferred
Regulations source
FishBase ↗ inferred

Safety

Danger to humans
Harmless sourced
First aid
This species is harmless to humans. No specific first aid is needed. Still handle the fish with care: mind the fin rays and the sharp edges of the gill cover, and rinse any scratch with clean water and cover it. For a dirty or deep wound check tetanus status. verified

Status & sources

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

Same genus Nannostomus

More from the family Lebiasinidae

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