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Nannostomus erythrurus — AI side-view illustration

Nannostomus erythrurus

Nannostomus erythrurus

A three-banded trade lookalike without a continuous red line

A slender silver-brown pencilfish with dark bands and small red fin-base patches. It is often traded under the three-lined pencilfish name.

Adult length
Up to 2.9 cm (standard length, without the tail fin)
Natural habitat
Native to fresh waters of Guyana, Bolivia and Brazil.

Trade names are mixed with N. trifasciatus. Confirm identity and monitor chasing and feeding.

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Appearance and identification

Distinguished by lateral-band position, extension onto the tail and the absence of a continuous fine red line. A faint red line in N. trifasciatus can be hard to see; use several characters and origin.

Same-species behaviour

Watch subordinate fish.

Diet and feeding

Feeds easily. Offer suitably sized food and check it is eaten.

Compatibility limits

A peaceful reputation is no guarantee; choose companions with care.

Aquarium environment

Provide retreats and observation space.

Sources

www.aquariumglaser.de ↗ 2026-10-23

www.fishbase.se ↗ 2026-10-25

pdfs.semanticscholar.org ↗ 2026-10-23

researcharchive.calacademy.org ↗ 2026-10-23

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