Elongate Hillstream Loach

Aborichthys elongatus is immediately recognisable by its extraordinarily elongated body — proportionally slimmer than almost any other loach in the hobby — and the bold dark lateral stripe running from snout to caudal base that contrasts sharply with its pale cream ground colour. It is native to the swift, clear rocky hill streams of the Himalayan foothills in northeastern India, where it navigates the interstitial spaces between boulders and cobbles that are inaccessible to larger fish.

In the aquarium, A. elongatus is an active and charismatic species that spends much of its time winding between rocks and driftwood. It requires clean, well-oxygenated, moderately to strongly flowing water and should not be kept at temperatures above 24 °C for extended periods. A sandy or fine-gravel substrate with smooth boulders allows the species to exhibit its natural behaviour of threading through gaps.

The species is peaceful and social; groups of five or more display interesting loose-shoaling behaviour and feed actively together. Its elongated body requires the keeper to use mesh or very fine sponge on filter intakes to prevent injury or entrapment. Feeding is easy — the species accepts most small sinking and bottom-directed prepared foods.

Water: 18–24°C, pH 6.5–7.5, GH 4–15, KH 2–8; moderate to strong flow with good oxygenation; cool conditions essential — avoid sustained temperatures above 24°C. Tank: 80 L minimum; smooth boulders with interstitial gaps, fine gravel or sand substrate; cover filter intakes with sponge to prevent body entrapment. Feeding: Omnivore — small sinking pellets, micro-wafers, frozen daphnia and cyclops; small mouth requires appropriately fine-grained food. Breeding: Not reliably documented in captivity; condition with modest cooling and increased flow; scatter-spawner likely. Compatibility: Peaceful and sociable; keep in groups of 5+; compatible with other South Asian hillstream species and small cool-water fish.