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AI illustration of Mastacembelus erythrotaenia, complete left-facing side view

Fire eel

Mastacembelus erythrotaenia

A long dark brown fish with red-orange lines that break into rear spots.

A long dark brown fish with red-orange lines that break into rear spots, a pointed rostrum and small pectoral fins.

Adult length
Up to 100 cm (standard length, without the tail fin)
Water temperature
24–28 °C
pH
6–7
Hardness
5–12 dGH
Natural habitat
Inhabits slow rivers and inundated plains on lowland floodplains.
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Appearance and identification

Peacock eel has rear dorsal eyespots rather than red-orange lines and spots.

Same-species behaviour

Often hides by day; conspecific aggression can occur.

Space requirements

Reaches 100 cm SL. Secure cover, soft sand, refuges and large facilities are essential.

Diet and feeding

Offer appropriately sized animal foods such as shrimp, fish and worms. Small fish may be eaten.

Aquarium environment

Burrowing and the large body can disturb planting. Retain sand, shelter and clear movement space.

Sources

www.aquariumglaser.de ↗ 2026-10-22

www.fishbase.se ↗ 2026-10-25

www.seriouslyfish.com ↗ 2026-10-22

PeekFish · Ornamental fish

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