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Unicolor Eel - (Mastacembelus unicolor)

Unicolor Eel - (Mastacembelus unicolor)

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Unicolor Eel - (Mastacembelus unicolor)
Fish Details, Description and Information Below:

🐟 Unicolor Eel – (Mastacembelus unicolor) – Rare African Freshwater Spiny Eel

The Unicolor Eel (Mastacembelus unicolor) is a rare and unique freshwater spiny eel species native to river systems and floodplains across Central and West Africa. As its name suggests, this species is characterized by its uniform brown to olive coloration, elongated snake-like body, and subtle mottling. Peaceful toward most tankmates but predatory toward very small fish, the Unicolor Eel is a fascinating oddball species for experienced aquarists who can provide a spacious, well-covered aquarium.


🔎 Quick Facts – Unicolor Eel (Mastacembelus unicolor)

  • 📛 Common Name: Unicolor Eel
  • 🔬 Scientific Name: Mastacembelus unicolor
  • 🌍 Origin: Central and West Africa – including Nile, Congo, and Niger River Basins
  • 🎨 Appearance: Uniform brown to olive body, elongated eel-like form, small dorsal and anal fins
  • 📏 Max Size: 20–24 inches (50–60 cm)
  • 💎 Availability: Rare in the aquarium trade; prized by oddball keepers

😇 Behavior & Temperament

  • 🤝 Generally peaceful with medium-to-large tankmates
  • ⚔️ May eat small fish that can fit in its mouth
  • 🌙 Nocturnal; most active at night
  • 🪵 Enjoys burrowing and hiding in tight spaces

🏠 Aquarium & Tank Requirements

  • 📦 Minimum Tank Size: 100+ gallons
  • 🪵 Provide sandy substrate for burrowing and plenty of hiding spots (PVC pipes, caves, driftwood)
  • 🌊 Gentle to moderate water flow
  • 💡 Dim lighting or shaded areas to match natural habitat

💧 Water Parameters – Unicolor Eel Care

  • 🌡️ Temperature: 75–82°F (24–28°C)
  • ⚗️ pH: 6.5–7.8
  • 💧 Hardness: Soft to moderately hard water

🍽️ Diet – Carnivorous

  • 🐟 Live or frozen foods such as bloodworms, earthworms, and small shrimp
  • 🦐 Pieces of fish or prawns
  • 🚫 Avoid feeder fish to prevent disease introduction

📋 Unicolor Eel Overview Table

Feature Details
🌍 Origin Central & West Africa – Nile, Congo, Niger River Basins
📏 Max Size 20–24 inches
😇 Temperament Peaceful with larger tankmates, predatory toward small fish
🏠 Tank Size 100+ gallons
⚗️ pH Range 6.5–7.8
🌡️ Temperature 75–82°F
🍽️ Diet Carnivorous – worms, shrimp, fish pieces
🎯 Ideal For Experienced oddball and eel keepers

✨ Highlight:
The Unicolor Eel is a rare African spiny eel with a sleek, uniform color and fascinating nocturnal behavior — a true showpiece for large, well-maintained oddball aquariums.

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