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AI illustration of Erpetoichthys calabaricus, complete left-facing side view

Ropefish

Erpetoichthys calabaricus

Rope-like body with an olive-brown back, yellow-orange belly and no pelvic fins.

Rope-like body with olive-brown back, yellow-orange belly and a dark pectoral-base patch; lacks the pelvic fins found in Polypterus.

Adult length
Up to 37 cm (standard length, without the tail fin)
Water temperature
23–30 °C
Lifespan
Up to 20 years
pH
6–7.5
Hardness
5–20 dGH
Native range
Africa: coastal species, inhabiting river estuaries from Ouémé River in Benin to Sanaga River in Cameroon.
Natural habitat
Inhabits slow rivers and standing waters, associated with reed beds.
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Appearance and identification

Much more slender than a Senegal bichir and lacks pelvic fins. Both need access to air; it is not a true eel.

Same-species behaviour

Mostly nocturnal.

Space requirements

Prevent escapes while keeping surface breathing access; plan for adult size. Use a 150 × 60 cm base.

Diet and feeding

Offer suitable animal foods and make sure slow feeders get enough; it may not take pellets.

Compatibility limits

Small fish are prey.

Aquarium environment

Soft substrate, plants and wood can provide cover. Keep surfacing routes open.

Sources

www.fishbase.se ↗ 2026-10-25

www.polypterus.info ↗ 2026-10-22

www.seriouslyfish.com ↗ 2026-10-22

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