Spiny Eel - Macrognathus siamensis

Peacock Spiny Eel (6–10 cm Juveniles)

Scientific Name: Macrognathus siamensis
Category: Freshwater Oddball Fish | Size: 6–10 cm | Temperament: Peaceful to Semi-Aggressive | Origin: Wild-Collected or Captive-Bred

The Peacock Spiny Eel is a fascinating and elegant oddball species, prized for its snake-like body, earthy tones, and eye-catching ocelli (“peacock spots”) along its flanks. These 6–10 cm juveniles are already showcasing their beautiful markings and curious behavior. A peaceful bottom-dweller with a preference for burrowing, this eel thrives in soft, sandy substrates and heavily planted aquariums.

Key Features:

• Distinctive elongated body with spotted, peacock-like patterning

• Intelligent and inquisitive; often recognizes regular caretakers

• Generally peaceful but may eat very small fish if underfed

• Burrows into substrate—needs soft sand and gentle filtration

Water Parameters:

• Temperature: 75–82°F

• pH: 6.5–7.5

• Soft to moderately hard water

Feeding:

• Carnivorous – bloodworms, blackworms, chopped earthworms, frozen foods

• May take sinking carnivore pellets over time

• Feed in dim light or at dusk to mimic natural behavior

Tank Requirements:

• Minimum tank size: 30 gallons (juveniles), 55+ gallons for adults

• Provide sand substrate for burrowing and security

• Decorate with driftwood, caves, and dense plant cover

• Secure lid essential – expert escape artists!

Ideal For:

Aquarists seeking an intelligent, unusual bottom-dweller with unique behavior and striking natural beauty. Perfect for oddball community tanks or Southeast Asian biotope setups.