Malabar Spiny Eel

Mastacembelus malabaricus is a spiny eel restricted to rivers draining the Western Ghats of peninsular India, a globally recognised biodiversity hotspot. Its natural habitat consists of soft, warm, well-oxygenated rivers flowing through dense tropical forest, and this origin makes it somewhat more sensitive to water quality than more widespread and generalist South Asian spiny eels.

Its pattern of dark irregular blotches on a brown body is attractive in a natural, understated way and suits a biotope aquarium representing the river systems of the Western Ghats alongside species such as Puntius barbs, hillstream loaches, and Batasio catfish. Fine sandy substrate, good filtration, and regular water changes are essential.

Earthworms and frozen bloodworm are the preferred foods and are accepted readily. The transition to sinking pellets can take longer with this species than with more generalised congeners. A well-planned Indian biotope aquarium with this species as centrepiece can be a truly authentic and rewarding setup for the dedicated South Asian fish enthusiast.

Water: Soft, pH 6.5–7.5, temperature 22–28°C, GH 3–12, KH 1–5. Tank: Minimum 160 L, fine sand, Western Ghats biotope decor, good oxygenation, sealed lid. Feeding: Carnivore; earthworms, bloodworm, tubifex, and sinking carnivore pellets. Breeding: Not documented in captivity. Compatibility: Peaceful with larger robust Indian community fish; avoid small species.