Stone Loach

The stone loach is a 10–12 cm bottom dweller that lives under stones in Europe's clean, fast-flowing streams. Its olive-brown body is covered with irregular dark blotches, and there are six short barbels around its mouth. Because it is very sensitive to water pollution, in the wild it is regarded as an indicator of clean water. Closely related loaches (for example Oxynoemacheilus species) also live in the rivers of Türkiye; most of them are endemic and should not be collected from the wild.

• At least 100 liters and 80–100 cm of length for 3–5 individuals.
• 10–20°C; no heater is needed, but cooling or a fan may be required in summer.
• Strong flow and plenty of oxygen are essential; a high-capacity filter and an air stone.
• Rounded gravel, flat stones and shelters under stones; a 30–50% water change every week.

In the wild it feeds on insect larvae, small crustaceans and worms. In the aquarium, offer bloodworms, daphnia, brine shrimp and sinking foods.

Peaceful; it is active at night and hides under stones during the day. Minor jostling over shelters can be seen among its own kind.

Good companions: peaceful fish that like cold, flowing water: White Cloud Mountain minnows, small coldwater barbs, hillstream loaches.

Avoid: goldfish, tropical species, still aquariums that do not meet its need for oxygen and flow.