Peacock Eel

Macrognathus siamensis is named for the striking row of eye-like spots or ocelli along the base of its dorsal fin, reminiscent of the tail feathers of a peacock. Native to slow-moving rivers and floodplains of Thailand and Cambodia, it is one of the most popular spiny eels due to its moderate size and relatively peaceful disposition.

In the aquarium it spends most of the day buried in sand or wedged beneath decor, emerging after lights-out to hunt invertebrates and small worms. Its burrowing behaviour is fascinating to observe, and providing adequate sandy substrate is essential for its wellbeing and stress reduction.

Feeding is straightforward once the fish settles: frozen bloodworm and tubifex are accepted readily, as are small earthworms and live blackworm. Many specimens eventually transition to sinking micro-pellets. A well-planted tank with dim lighting and multiple hiding spots produces the most confident individuals.

Water: Soft to moderately hard, pH 6.5–7.5, temperature 24–28°C, GH 3–12, KH 1–6. Tank: Minimum 100 L, fine sand, planted perimeter, low lighting, fully sealed lid. Feeding: Carnivore; bloodworm, tubifex, small earthworms, blackworm, and sinking micro-pellets. Breeding: Rarely bred; soft warm water and dense planting can trigger egg-scattering behaviour. Compatibility: Peaceful with medium to large community fish; avoid very small tankmates.