Spiny Eel (Mastacembelus & Macrognathus spp.)

Description

Spiny Eel (Mastacembelus & Macrognathus spp.)

Curious, intelligent and unlike almost any other aquarium fish, Spiny Eels are fascinating bottom-dwelling predators that quickly become the stars of the aquarium. Despite their eel-like appearance, they are not true eels and are renowned for recognising their keepers, exploring every corner of the tank and developing surprisingly interactive personalities.

Quick Facts

  • Scientific group: Mastacembelus & Macrognathus species
  • Common names: Spiny Eel, Peacock Eel, Fire Eel, Tire Track Eel (species dependent)
  • Current size: Please refer to the selected size option
  • Adult size: Varies by species from approximately 15 cm to over 90 cm
  • Tank size: 120L+ (larger species require substantially bigger aquariums)
  • Difficulty: 🟑 Moderate
  • Temperament: Peaceful predator
  • Social needs: Depends on species; many are best kept singly or in carefully planned groups

Is this for you?

βœ”οΈ Perfect if:

  • You enjoy intelligent, interactive fish with unique behaviour.
  • You have a mature aquarium with soft substrate.
  • You appreciate unusual oddball species.
  • You can provide appropriately sized tank mates.

❌ Avoid if:

  • You keep nano fish or shrimp.
  • Your aquarium has sharp gravel.
  • You cannot provide a tightly covered aquarium.
  • You want a fish that remains visible all day.

Why choose a Spiny Eel?

Spiny Eels are among the most captivating freshwater fish available. Their long, flexible bodies, extended snouts and curious nature often lead people to mistake them for true eels, but they actually belong to an entirely different family of freshwater fishes.

Many species spend their day partially buried beneath soft sand with only their head exposed before becoming increasingly active during the evening. As they settle into their environment, they often learn to recognise their keeper and may even feed directly from your hand.

Their personalities are every bit as impressive as their appearance. Rather than constantly swimming, Spiny Eels slowly investigate caves, plants and driftwood, making every aquarium feel more natural and alive.

Benefits

  • Unique eel-like appearance
  • Highly intelligent and interactive
  • Excellent feature fish for larger aquariums
  • Peaceful with appropriately sized tank mates
  • Fascinating burrowing behaviour
  • Long-lived with proper care

Care made simple

  • Temperature: 24–28Β°C (species dependent)
  • pH: 6.5–7.8
  • Diet: Carnivorous pellets, earthworms, blackworms, bloodworms, prawns and frozen meaty foods
  • Water: Clean, stable and well-filtered
  • Substrate: Fine sand is strongly recommended to allow natural burrowing behaviour.
  • Setup: Driftwood, caves, plants and shaded hiding places
  • Always provide a tightly fitting lid, as Spiny Eels are excellent escape artists.
  • Select tank mates too large to fit into their mouth.

Pairs perfectly with

  • Severums
  • Geophagus
  • Silver Dollars
  • Rainbowfish (larger species)
  • Plecos
NTA Insight:
"Spiny Eel" describes an entire group of species rather than a single fish. Some species remain around 15–20 cm, while others exceed 90 cm as adults. Before purchasing, always check the expected adult size of your particular species to ensure your aquarium can accommodate it for life. Regardless of species, soft sand and a secure lid are two of the most important ingredients for long-term success.

FAQ

Are Spiny Eels true eels?

No. Despite their appearance, Spiny Eels are not true eels. They belong to their own family of freshwater fishes and have different anatomy and behaviour.

How large do Spiny Eels grow?

This depends entirely on the species. Smaller species may reach around 15–20 cm, while larger species such as Fire Eels and Tire Track Eels can exceed 70–90 cm.

Do they need sand?

Yes. Fine sand is highly recommended because many species naturally burrow. Sharp gravel may damage their delicate skin and underside.

Will they eat smaller fish?

Yes. Spiny Eels are peaceful predators and will consume any fish small enough to fit into their mouth.

Can they be kept together?

Some species can coexist successfully in large aquariums with multiple hiding places, while others are more territorial. Compatibility depends on the species and available space.

What do Spiny Eels eat?

They thrive on a varied carnivorous diet including earthworms, blackworms, bloodworms, prawns, frozen foods and quality sinking carnivore pellets.

Are Spiny Eels suitable for beginners?

They are better suited to aquarists with some experience due to their specialised requirements, escape tendencies and sensitivity to poor water quality.

How long do Spiny Eels live?

With excellent care, many Spiny Eel species commonly live for 10–15 years, with some larger species living even longer.

Spiny Eel (Mastacembelus & Macrognathus spp.)

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$40.00


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    Description

    Spiny Eel (Mastacembelus & Macrognathus spp.)

    Curious, intelligent and unlike almost any other aquarium fish, Spiny Eels are fascinating bottom-dwelling predators that quickly become the stars of the aquarium. Despite their eel-like appearance, they are not true eels and are renowned for recognising their keepers, exploring every corner of the tank and developing surprisingly interactive personalities.

    Quick Facts

    • Scientific group: Mastacembelus & Macrognathus species
    • Common names: Spiny Eel, Peacock Eel, Fire Eel, Tire Track Eel (species dependent)
    • Current size: Please refer to the selected size option
    • Adult size: Varies by species from approximately 15 cm to over 90 cm
    • Tank size: 120L+ (larger species require substantially bigger aquariums)
    • Difficulty: 🟑 Moderate
    • Temperament: Peaceful predator
    • Social needs: Depends on species; many are best kept singly or in carefully planned groups

    Is this for you?

    βœ”οΈ Perfect if:

    • You enjoy intelligent, interactive fish with unique behaviour.
    • You have a mature aquarium with soft substrate.
    • You appreciate unusual oddball species.
    • You can provide appropriately sized tank mates.

    ❌ Avoid if:

    • You keep nano fish or shrimp.
    • Your aquarium has sharp gravel.
    • You cannot provide a tightly covered aquarium.
    • You want a fish that remains visible all day.

    Why choose a Spiny Eel?

    Spiny Eels are among the most captivating freshwater fish available. Their long, flexible bodies, extended snouts and curious nature often lead people to mistake them for true eels, but they actually belong to an entirely different family of freshwater fishes.

    Many species spend their day partially buried beneath soft sand with only their head exposed before becoming increasingly active during the evening. As they settle into their environment, they often learn to recognise their keeper and may even feed directly from your hand.

    Their personalities are every bit as impressive as their appearance. Rather than constantly swimming, Spiny Eels slowly investigate caves, plants and driftwood, making every aquarium feel more natural and alive.

    Benefits

    • Unique eel-like appearance
    • Highly intelligent and interactive
    • Excellent feature fish for larger aquariums
    • Peaceful with appropriately sized tank mates
    • Fascinating burrowing behaviour
    • Long-lived with proper care

    Care made simple

    • Temperature: 24–28Β°C (species dependent)
    • pH: 6.5–7.8
    • Diet: Carnivorous pellets, earthworms, blackworms, bloodworms, prawns and frozen meaty foods
    • Water: Clean, stable and well-filtered
    • Substrate: Fine sand is strongly recommended to allow natural burrowing behaviour.
    • Setup: Driftwood, caves, plants and shaded hiding places
    • Always provide a tightly fitting lid, as Spiny Eels are excellent escape artists.
    • Select tank mates too large to fit into their mouth.

    Pairs perfectly with

    • Severums
    • Geophagus
    • Silver Dollars
    • Rainbowfish (larger species)
    • Plecos
    NTA Insight:
    "Spiny Eel" describes an entire group of species rather than a single fish. Some species remain around 15–20 cm, while others exceed 90 cm as adults. Before purchasing, always check the expected adult size of your particular species to ensure your aquarium can accommodate it for life. Regardless of species, soft sand and a secure lid are two of the most important ingredients for long-term success.

    FAQ

    Are Spiny Eels true eels?

    No. Despite their appearance, Spiny Eels are not true eels. They belong to their own family of freshwater fishes and have different anatomy and behaviour.

    How large do Spiny Eels grow?

    This depends entirely on the species. Smaller species may reach around 15–20 cm, while larger species such as Fire Eels and Tire Track Eels can exceed 70–90 cm.

    Do they need sand?

    Yes. Fine sand is highly recommended because many species naturally burrow. Sharp gravel may damage their delicate skin and underside.

    Will they eat smaller fish?

    Yes. Spiny Eels are peaceful predators and will consume any fish small enough to fit into their mouth.

    Can they be kept together?

    Some species can coexist successfully in large aquariums with multiple hiding places, while others are more territorial. Compatibility depends on the species and available space.

    What do Spiny Eels eat?

    They thrive on a varied carnivorous diet including earthworms, blackworms, bloodworms, prawns, frozen foods and quality sinking carnivore pellets.

    Are Spiny Eels suitable for beginners?

    They are better suited to aquarists with some experience due to their specialised requirements, escape tendencies and sensitivity to poor water quality.

    How long do Spiny Eels live?

    With excellent care, many Spiny Eel species commonly live for 10–15 years, with some larger species living even longer.

    Live Arrival & Ordering FAQ

    Why do livestock prices sometimes change?

    Unlike manufactured products, fish and shrimp continue to grow and develop over time. Their value changes as they increase in size, develop colour, or become breeding pairs.

    Our prices are based on the current size, quality and availability of each specimen. While pricing often remains stable for around 3–4 months, it may be updated at any time to reflect these changes.

    We always aim to offer healthy, high-quality livestock at fair and competitive prices.

    Do you offer a live arrival guarantee?

    Yes. All livestock is covered by our Live Arrival Guarantee.

    In the rare event of DOA, please contact us promptly with clear photos of the livestock in the original unopened bag.

    Please review our full DOA and store policies before purchase.

    Can you ship to all states in Australia?

    No. Due to state restrictions, we cannot ship livestock or live plants to WA and TAS.

    What should I check before ordering?

    Before placing an order, make sure:

    • Your tank is fully cycled and stable
    • Your aquarium has enough space for the species
    • Your current livestock are compatible in temperament, size, and requirements
    • Your water parameters, habitat, and temperature suit the species
    • You are not adding too many fish at once
    What should I expect when my fish arrives?

    It is normal for fish, shrimp, or snails to look pale, stressed, or less active after shipping.

    This is temporary. Most livestock will settle and regain colour within a few days.

    How long does it take for fish to settle in?

    Most livestock will take 3–7 days to fully adjust to their new environment.

    Should I feed my fish immediately after arrival?

    No. We recommend waiting 24 hours before feeding to allow them to settle.

    If you already have fish in your tank, feeding them before introducing new arrivals can help reduce stress.

    Why do fish sometimes struggle after being added to a tank?

    In most cases, issues are caused by tank conditions, not shipping.

    • Uncycled or unstable tanks
    • Poor water parameters
    • Overstocking
    • Unsuitable tank mates
    What is Nano Tanks Australia’s main tip for new livestock?

    Most livestock losses happen in immature or unstable tanks, not during shipping.

    If your setup is not fully established, the risk to new arrivals is significantly higher.

    Not sure if this fish is right for your setup?

    If you are unsure whether this species suits your setup, contact us before ordering and we’ll help point you in the right direction.

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