Unicolor Eel

The Unicolor Eel is a less commonly seen freshwater spiny eel with subdued dark coloration and pale patterning or fin edging. Its long body and probing snout make it fascinating to watch as it investigates cover. This is a specialist fish for a spacious, carefully arranged aquarium.

Fish details

• Scientific name: Mastacembelus unicolor
• Size offered: Contact us for the current size
• Adult size: A large spiny eel; specimens of 50–60 cm are documented, so plan substantial adult space
• Origin: Southeast Asia, including Indonesia
• Water type: Freshwater
• Temperament: Generally reserved; a predator of small fish and invertebrates

Recommended aquarium conditions

• Aquarium: Large, long aquarium with broad floor space and several adult-sized shelters; discuss the final footprint before purchase
• Temperature: 24–28°C (75–82°F)
• pH: 6.0–7.5 as a practical care target

Provide fine sand and smooth, generously sized hiding places. Arrange wood and rocks securely, preserve open routes between shelters, and avoid sharp edges. A secure lid is essential. Maintain a mature biological filter, clean water, and oxygenation without directing all of the flow into its resting place.

Diet and feeding

Offer a varied selection of appropriate earthworms and thawed aquatic foods, with pieces sized for the eel's mouth. Target-feeding near cover can help a shy arrival begin eating. Ask what the current stock is taking, since accepting dry foods should not be assumed.

Compatibility and care

Choose peaceful companions too large to swallow, and avoid species that compete aggressively for bottom-dwelling food. Small shrimp and tiny fish are unsuitable companions. A single eel is generally easier to accommodate than several. Observe its body condition and actual food intake, not just whether food has disappeared from the tank. Individual markings vary, and a listed juvenile size would not represent an adult size guarantee.

Sizes are approximate. Contact Las Vegas Exotic Fish at (702) 685-5100 to confirm availability or discuss your setup.