A massive, predatory spiny eel known for its distinctive tire-track patterning. They are nocturnal bottom-dwellers that love to burrow. A soft sand substrate is absolutely mandatory; sharp gravel will severely damage their skin and lead to fatal bacterial infections. While peaceful to fish too large to swallow, they are highly efficient predators that will eat any tank mate that fits into their surprisingly large mouths. Excellent escape artists; a heavy, tight-fitting lid is required.
At a Glance
Tank Requirements
Water Parameters
Temperament & Compatibility
Available Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard / Adult
The fully grown adult form. Requires a massive tank with a substantial footprint to maneuver. Very intolerant of other spiny eels at this size; best kept as a solitary bottom-dweller with large, peaceful mid-water or top-dwelling fish.
Differs in 1 trait from base species
Also known as: Full Grown, Adult Tire Track Eel
Juvenile (Grow-out)
Sold at a small size (typically 10-15cm) but grows rapidly. A juvenile can temporarily reside in a smaller grow-out tank (55+ gallons) but will quickly require a permanent massive enclosure. They must be kept on soft sand even as babies to practice burrowing.
Differs in 4 traits from base species
Also known as: Baby Eel, Small Spiny Eel
Tire Track Eel Care Guide Summary
The Tire Track Eel, scientifically known as Mastacembelus armatus, belongs to the Oddballs family group. Adults reach a maximum size of approximately 75 cm and have a eel body shape with a moderate growth rate. Classified as semi-aggressive, this species primarily occupies the bottom zone of the aquarium and produces a high level of biological waste.
To thrive, the Tire Track Eel requires a freshwater only aquarium with a minimum volume of 680 litres and a tank length of at least 180 cm. Water temperature should be maintained between 22°C and 28°C, with a pH range of 6.5–7.5 and a general hardness of 5–15 dGH. A moderate water flow is preferred.
Due to its specialist needs, the Tire Track Eel is best suited for fishkeepers who can provide a carefully planned setup. This species is available in 2 varieties: Standard / Adult and Juvenile (Grow-out). Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.
Tire Track Eel Habitat Setup
When setting up an aquarium for the Tire Track Eel, a moderate water flow best suits their natural preferences. Because this species occupies the bottom zone, the aquarium layout should prioritise sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include a sand substrate to accommodate their sifting behaviour, smooth gravel or rounded substrate to protect their sensitive barbels, and driftwood, which can serve as both a hiding place and a dietary supplement. Keepers should note that a tight-fitting lid is essential, as this species is a known jumper and expect substrate disturbance, so lightweight décor should be secured.
Tire Track Eel Compatibility Notes
Classified as semi-aggressive, the Tire Track Eel is best housed alone, as they do not tolerate others of their kind in confined spaces. When choosing tankmates, any fish small enough to fit in its mouth will likely be eaten, ornamental shrimp are not safe companions, and conspecific aggression can be intense, especially in smaller tanks. Selecting tankmates that favour different water layers from the bottom zone can help reduce competition and territorial overlap.
Tire Track Eel Feeding & Diet Considerations
The Tire Track Eel is a predatory species that will readily consume small fish, so nano or bite-sized tankmates should be avoided, will hunt and eat ornamental shrimp, making it unsuitable for shrimp-focused setups, and is primarily active at dusk and dawn, so offering food shortly after lights-off ensures it receives adequate nutrition.
Frequently Asked Questions About Tire Track Eel
How big does Tire Track Eel get?+
What tank size does Tire Track Eel need?+
What water parameters does Tire Track Eel need?+
Is Tire Track Eel peaceful or aggressive?+
Can Tire Track Eel live with others of its kind?+
Is Tire Track Eel safe with shrimp?+
Does Tire Track Eel have any special tank requirements?+
Does Tire Track Eel need a lid on the tank?+
Similar Species
Fire Eel
Mastacembelus erythrotaenia
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Senegal Bichir
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Red-Tail Catfish
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Striped Raphael Catfish
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A highly robust, armored catfish native to the Amazon and Orinoco basins. Famous for their ability to produce audible squeaking or grunting sounds when distressed or defending territory. They are nocturnal scavengers that spend most of the day hiding in driftwood or caves. Note: Their rigid pectoral spines can easily become tangled in standard aquarium nets.
Common Pleco
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A heavily armored, nocturnal catfish famous for eating algae. However, they grow incredibly large, produce massive amounts of waste, and frequently outgrow standard aquariums. They require driftwood in their diet for digestion. As they age, they may become territorial or develop a taste for the slime coat of slow-moving, flat-bodied tank mates.