Zig-zag Eel
Mastacembelus armatus
Zig-zag Eel is a bottom-dwelling fish. Best kept as a solitary specimen.
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Explore compatibility, care or problems using this guide and your aquarium’s conditions.
Quick facts
- Adult size
- 19.7–35.4" (50–90 cm)
- Aquarium size
- 159 US gal (600 L) or larger / ≥ 70.9" (≥ 180 cm) minimum length
- Care level
- Advanced
- Temperament
- Large nocturnal predator of small tankmates; may be aggressive to conspecifics but not uniformly aggressive to large non-prey fish.
- Swimming zone
- Bottom dweller
- Temperature
- 75–82°F (24–28°C)
- pH
- 6–7.5
- GH
- 5–12 dGH
- KH
- 2–10 dKH
- Diet
- Carnivore
- Lifespan
- 8–12 years
- Group behavior
- Best kept as a solitary specimen
Care requirements
Care level: Advanced.
Lifespan: 8–12 years.
Aquarium size and space needs
Minimum aquarium size: 159 US gal (600 L) or larger / ≥ 70.9" (≥ 180 cm) minimum length. Plan the layout and stocking within that limit.
Water parameters
Suitable water: temperature 24–28 °C, pH 6–7.5, GH 5–12 dGH, KH 2–10 dKH.
Temperament and compatibility
Zig-zag Eel is aggressive and needs carefully selected companions.
- Plant safe
- Yes
Swimming zone and behavior
This fish uses the bottom area, so leave enough open substrate area for movement and feeding.
Feeding
Use foods that suit a meatier diet and avoid combining it with fish small enough to be treated as food.
Offer sinking meaty foods such as prawns, krill, fish pieces and appropriately sized frozen foods; feed in subdued conditions and monitor intake.
Before adding this fish
- Plan for an aquarium of 159 US gal (600 L) or larger / ≥ 70.9" (≥ 180 cm) minimum length.
- Choose other fish carefully around this temperament.
- Best kept as a solitary specimen.
- Offer a varied diet suited to this species’ documented feeding habits.
Natural habitat and origin
Origin: South and Southeast Asia.
Natural habitat: Streams, rivers, wetlands, marshes and floodplains from Pakistan across South and Southeast Asia to Indonesia. Adults often remain on or partly buried in the substrate.
Breeding notes
Breeding difficulty: Not documented in home aquariums.
The species can reach approximately 90 cm in total length. Aquarium specimens may remain closer to 50–75 cm, but housing must be planned for the maximum rather than the sale size. Coarse gravel can damage the skin and snout.
Important notes
- May reach 90 cm.
- Requires soft sand and secure hiding places.
- Requires a completely escape-proof lid.
- Will consume small fish, shrimp and other invertebrates.
Similar fish profiles
Use these profiles to compare fish with similar care level, size, temperature range, or swimming behavior.
FAQ
How large does Zig-zag Eel get?
Zig-zag Eel reaches 19.7–35.4" (50–90 cm). It needs specialist housing, long-term space, strong filtration, and carefully chosen companions.
What aquarium size does Zig-zag Eel need?
Use an aquarium of at least 159 US gal (600 L) or larger / ≥ 70.9" (≥ 180 cm) minimum length.
Is Zig-zag Eel peaceful?
Zig-zag Eel should be planned cautiously with compatible fish only, because aggressive behavior can limit companion options.
What temperature is suitable for Zig-zag Eel?
Keep it between 24 to 28 °C.
Should Zig-zag Eel be kept alone or in a group?
Zig-zag Eel: Best kept as a solitary specimen.
