How large do Tire Track Eels get?

In the wild, they can reach up to 90 cm (35 inches) in length. In captivity, they typically grow to around 50-70 cm, which still requires an exceptionally large aquarium.

Can I keep a Tire Track Eel with gravel?

No. Coarse or sharp gravel will scratch their undersides as they attempt to burrow, leading to severe bacterial infections and septicaemia. Fine sand is essential.

Why is my Tire Track Eel trying to jump out?

These fish are natural explorers and notorious escape artists, often seeking out small gaps where pipes enter the tank. A completely secure, tight-fitting, and weighted lid is mandatory to prevent fatal escapes.

Will a Tire Track Eel eat smaller fish?

Yes. They are opportunistic nocturnal predators. Any tankmate small enough to fit in their mouth, such as neon tetras or small corydoras, will eventually become a meal.

How often should I feed my Tire Track Eel?

Juveniles should be fed daily, while adults can be fed a substantial meaty meal every other day. Earthworms, prawns, and thick bloodworms are ideal.

FreshwaterTropicalIntermediate

Tire Track Eel

Mastacembelus armatus

A large, fascinating bottom-dwelling oddball known for its intricate zigzag markings, snake-like appearance, and remarkable burrowing behaviour.

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Ideal Conditions

Temperature: 22 – 28 °C
pH range: 6.5 – 7.5
Hardness: 5 – 15 dGH
Adult size: 50 – 90 cm
Minimum 500 litres for a fully grown adult: 500 litres+
Lifespan: 10 – 15 years
Diet: Carnivore
Water flow: moderate
Preferred setup: Soft sand substrate is essential for burrowing, with plenty of smooth rocks, driftwood, and secure hiding spaces. A completely sealed lid is strictly required.

About the Tire Track Eel

Mastacembelus armatus, commonly known as the Tire Track Eel or Zigzag Eel, is a true heavyweight of the freshwater aquarium hobby. Despite its common name, it is a spiny eel (family Mastacembelidae) rather than a true eel. Known for their distinctly elongated, snake-like bodies and a beautifully patterned network of dark markings, these fish make spectacular centrepieces for oversized aquariums. They possess a long, fleshy snout which they use to root around in the substrate for food.

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Is it right for your tank?

Check Tire Track Eel against a habitat you already keep. We compare water type, temperature, pH, adult size, group needs and everything living there.

Where Tire Track Eel comes from

Native range

South Asia, Southeast Asia

Countries / regions

India, Pakistan, Thailand, Vietnam, China

Habitat

Flowing streams, rivers, and tranquil coastal wetlands with soft mud or sand substrates.

Widespread across a huge range in Asia, adapting to various riverine and wetland environments.

Similar species

Fire Eel
Mastacembelus erythrotaenia
Peacock Spiny Eel
Macrognathus siamensis
Half-banded Spiny Eel
Macrognathus circumcinctus

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Tinfoil Barb
Barbonymus schwanenfeldii
Large, fast-moving mid-water fish that easily evade the eel and are too large to be eaten.
Great
Severum
Heros efasciatus
A robust, relatively peaceful cichlid that occupies the middle and upper levels of the tank, avoiding territorial disputes.
Great
Bichirs
Polypterus spp.
Both are large bottom-dwellers; they may compete for hiding spots and food, requiring a very large footprint to coexist.
Compatible with caution
Other Spiny Eels
Mastacembelidae
Conspecifics and similar species often display territorial aggression towards one another unless the aquarium is exceptionally large.
Compatible with caution
Neon Tetra
Paracheirodon innesi
Far too small; will be viewed as prey and quickly consumed during the night.
Not recommended
Cherry Shrimp
Neocaridina davidi
Natural prey for spiny eels; they will be eaten instantly.
Not recommended

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