Overview
The Rope Fish (Erpetoichthys calabaricus) is a primitive, eel-like fish from West and Central Africa. A member of the ancient Polypteridae family, it possesses both gills and a primitive lung, allowing it to breathe air. Peaceful with larger tank mates but will eat small fish.
Scientific Classification
| Rank | Classification |
|---|---|
| Family | Polypteridae |
| Genus | Erpetoichthys |
| Species | Erpetoichthys calabaricus |
| Water type | freshwater |
Natural Habitat
Native to slow-moving, oxygen-poor swamps and floodplains of West and Central Africa.
Appearance
Extremely elongated with a segmented body resembling a rope, olive-brown coloured with small paired pectoral fins used for crawling.
Behavior
Primarily nocturnal, hiding during the day and hunting at night. Peaceful toward fish too large to swallow but preys on small fish and invertebrates.
| Trait | Value |
|---|---|
| Temperament | Peaceful nocturnal predator |
| Schooling | No |
| Activity level | nocturnal |
Water Requirements
| Parameter | Ideal Range | Notes |
|---|---|---|
| Temperature | 24–28°C (75–82°F) | Use a reliable adjustable heater |
| pH | 6.5–7.5 | Avoid sudden swings |
| Hardness (GH) | 4-18 dGH dGH | Soft to moderately hard |
| Ammonia | 0 ppm | Any detectable ammonia signals a problem |
| Nitrite | 0 ppm | Toxic even at low levels |
| Nitrate | <20 ppm | Manage through regular partial water changes |
| Min. tank | 200L (53 gal) | Larger tanks are easier to keep stable |
Interesting Facts
- Can breathe atmospheric air and survive brief periods out of water
- One of the most ancient fish lineages, largely unchanged for 400 million years
- Uses its pectoral fins to crawl along the substrate
📋 Full Care Guide
Ready to set up a tank for your Rope Fish? The complete care guide covers tank setup, feeding schedule, common diseases, tank mates, and breeding.
Read Rope Fish Care Guide →Related Species
Related Species & Guides
This species profile was reviewed for biological accuracy and practical aquarium care guidance. For suspected illness or disease, test your water parameters first and consult an aquatic veterinarian if symptoms persist.